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Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math

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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 01 Mar 2019, 07:57
Hi Karishma,
A certain box has only a total of 7 red balls and green balls. If two balls are selected randomly from the box and one ball at a time with replacement, what is the number of red balls?

1) The probability that two balls selected are green balls is (4/7)(4/7)
2) The probability that two balls selected are not green balls is (3/7)(3/7)
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 01 Mar 2019, 07:58
Hi Karishma,
Of 10 balls, 5 are red balls, 3 are blue balls, and 2 are yellow balls in a jar. If 2 balls are selected at random from the jar, what is the probability that one ball selected is red and the other ball is blue?
A. 1/5 B. 1/4 C. 1/3 D. 1/2 E. 2/3
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 03 Mar 2019, 08:28
Hi Karishma,

I have been facing difficulty in doing quant questions using the logical approach. I usually get the answers correct but I often use long and time consuming algebraic methods. Is there any material I should go through to get better at applying a logical approach to solve quant questions?

Thanks.
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 03 Mar 2019, 20:28
indu1954 wrote:
Hi Karishma,
Of 10 balls, 5 are red balls, 3 are blue balls, and 2 are yellow balls in a jar. If 2 balls are selected at random from the jar, what is the probability that one ball selected is red and the other ball is blue?
A. 1/5 B. 1/4 C. 1/3 D. 1/2 E. 2/3


Probability of picking a red ball first = 5/10
Probability of picking a blue ball next = 3/9
Probability of picking a red and then a blue ball = (5/10)*(3/9) = 1/6

Probability of picking a blue ball first = 3/10
Probability of picking a red ball next = 5/9
Probability of picking a blue and then a red ball = (3/10)*(5/9) = 1/6

Probability of picking a red and a blue ball = (1/6) + (1/6) = 1/3

Answer (C)
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 05 Mar 2019, 01:20
Thank you Karishma for your response. I have started going through the blog. It's really helpful.

I have a quick question:

For how many values of x, is |x – 3| + 3|x + 1| + |x| = 4?

In your blog, you have said that the answer is 0. Could you please explain why?
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 05 Mar 2019, 12:22
Thanks Karishma ,
I need to ask one more question

1)Of 45 persons, 28 subscribed to the newspaper A, 17 did to the newspaper B, and 12 did to the newspaper C. 7 persons subscribed to both the newspaper A and the newspaper B, 8 did to both the newspaper B and the newspaper C, and 9 did to both the newspaper C and the newspaper A. If 6 persons did not subscribe all of the 3 newspapers, what is the number of the persons who subscribed only one newspaper?

A. 18 B. 21 C. 24 D. 27 E. 30
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New post 06 Mar 2019, 01:44
rawat2583 wrote:
Thanks Karishma ,
I need to ask one more question

1)Of 45 persons, 28 subscribed to the newspaper A, 17 did to the newspaper B, and 12 did to the newspaper C. 7 persons subscribed to both the newspaper A and the newspaper B, 8 did to both the newspaper B and the newspaper C, and 9 did to both the newspaper C and the newspaper A. If 6 persons did not subscribe all of the 3 newspapers, what is the number of the persons who subscribed only one newspaper?

A. 18 B. 21 C. 24 D. 27 E. 30


First check this post on overlapping sets: https://www.veritasprep.com/blog/2015/1 ... ping-sets/

Total = n(A) + n(B) + n(C) – n(A and B) – n(B and C) – n(C and A) + n(A and B and C) + n(No Set)

45 = 28 + 17 + 12 - 7 - 8 - 9 + n(A and B and C) + 6

n(A and B and C) = 6

n(Exactly one set) = n(A) + n(B) + n(C) – 2*n(A and B) – 2*n(B and C) – 2*n(C and A) + 3*n(A and B and C)
n(Exactly one set) = 28 + 17 + 12 - 2*7 - 2*8 - 2*9 + 3*6 = 27

P.S. - Please always send me the original question and the source too. Thanks!
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Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 10 Mar 2019, 09:07
VeritasKarishma wrote:
indu1954 wrote:
Hi Karishma,
Of 10 balls, 5 are red balls, 3 are blue balls, and 2 are yellow balls in a jar. If 2 balls are selected at random from the jar, what is the probability that one ball selected is red and the other ball is blue?
A. 1/5 B. 1/4 C. 1/3 D. 1/2 E. 2/3


Probability of picking a red ball first = 5/10
Probability of picking a blue ball next = 3/9
Probability of picking a red and then a blue ball = (5/10)*(3/9) = 1/6

Probability of picking a blue ball first = 3/10
Probability of picking a red ball next = 5/9
Probability of picking a blue and then a red ball = (3/10)*(5/9) = 1/6

Probability of picking a red and a blue ball = (1/6) + (1/6) = 1/3

Answer (C)


Thanks Karishma
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 13 Mar 2019, 19:12
Hy Karishma,
I red your some post, which very helpful
I have been preparing since half year, i have given one attempt but score 440, i need just 600 score and have more one month.My split was Q40 and V15 which soo wiered please help me in boosting verbal to V30
I am lacking most at CR and SC which are crucial
I have one month plzzz help me out in this regard
How i can contact you on personal E-mail.

Posted from my mobile device
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 13 Mar 2019, 20:33
SNHRY wrote:
Hy Karishma,
I red your some post, which very helpful
I have been preparing since half year, i have given one attempt but score 440, i need just 600 score and have more one month.My split was Q40 and V15 which soo wiered please help me in boosting verbal to V30
I am lacking most at CR and SC which are crucial
I have one month plzzz help me out in this regard
How i can contact you on personal E-mail.

Posted from my mobile device


Hey SNHRY,

Feel free to PM me by clicking on the "Send PM" link on the left hand side.
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Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 13 Mar 2019, 21:01
Sorry karishma i m not finding Send PM link on the left side of this post
Please clear it how i can contact you.

ohhh sorry sorry iwas not getting in mobile now got it when login through laptop.
i have sent you PM please reply there
thank u
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math  [#permalink]

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New post 19 Mar 2019, 09:25
Hi karishma,
I need help in this question
1/ (statistics) 21 students took an exam. What is the number of students whose scores are at least the average (arithmetic mean) score of them?
1) The average (arithmetic mean) score of them is 78

2) The median score of them is 78
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New post 20 Mar 2019, 06:27
Thanks karishma ,really appreciated your Help.
I need to ask one more Question

In the xy-plane, a circle with the center of the origin has the x- intercepts of P(50,0) and R(-50,0). If Q is a point on the circle, what is the length of PQ?

1) The x-coordinate of Q is -40

2) The y-coordinate of Q is -30
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New post 23 Mar 2019, 18:01
Thanks Karishma,
I have a quick question:

The 3 ships will transport goods. Of all of the goods, 1/3 is transported by the first ship. And, of the remained goods, 1/3 is transported by the second ship and also, of the remained goods after 2 times transports, 1/3 is transported by the third ship. If the remained goods are 40 tons finally, what is the total weight of the goods before transports, in tons, originally?
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New post 23 Mar 2019, 18:03
Hi Karishma,
In a certain flower bed, the flower X species with only green color and yellow color accounts for 3/8 of all flowers. If the flowers with green color account for 3/4 of the flower X species, what fraction of all flowers in the flower bed are yellow colors?

A. 1/32 B. 1/16 C. 3/32 D. 1/8 E. 5/32
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New post 24 Mar 2019, 20:31
Sandeepanisha - The above given two questions are very similar and I have solved them using two different methods - algebra and assuming a number.
You can do both using both methods. I encourage you to try.
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New post 26 Mar 2019, 15:46
Thanks Karishma,I will

Source of question-Random material

VeritasKarishma wrote:
Sandeepanisha - The above given two questions are very similar and I have solved them using two different methods - algebra and assuming a number.
You can do both using both methods. I encourage you to try.
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New post 10 May 2019, 22:07
Hi VeritasKarishma

Can you tell me whats wrong with this approach?

https://gmatclub.com/forum/what-is-the- ... l#p2272622
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New post 10 May 2019, 23:26
gmat1393 wrote:
Hi VeritasKarishma

Can you tell me whats wrong with this approach?

https://gmatclub.com/forum/what-is-the- ... l#p2272622


Done.
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New post 23 May 2019, 06:20
Hi Karishma,
(ratio) Donuts of r pounds are made by sugars of p pounds. Because there are no sugars, substitutions of t pounds per sugar of 1 pound are used to make donuts. How many pounds of substitutions are used to make donut of 1 pound in terms of p, r, and t?
A) tp/r B.) tr/p C) t/pr D.) r/tp E pr/t
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Re: Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math   [#permalink] 23 May 2019, 06:20

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Veritas Prep PS Forum Expert - Karishma - Ask Me Anything about Math

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