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# ps - last digit

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Joined: 30 Sep 2004
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11 Dec 2005, 07:16
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When which of the seven digits in 452*36*17 is plus 1, the product will increase by less than 1000?
A. 1
B. 2
C. 5
D. 7
E. 4
_________________

If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

Kudos [?]: 412 [0], given: 0

SVP
Joined: 24 Sep 2005
Posts: 1884

Kudos [?]: 379 [0], given: 0

Re: ps - last digit [#permalink]

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11 Dec 2005, 07:47
christoph wrote:
When which of the seven digits in 452*36*17 is plus 1, the product will increase by less than 1000?
A. 1
B. 2
C. 5
D. 7
E. 4

B it is
as we observe: 452*2= 904 ----> slightly change in 36 or 17 can increase the product a lot
36*17<36*20 = 720---->adding 1 to 2 of 452 satisfies the question.

Kudos [?]: 379 [0], given: 0

SVP
Joined: 24 Sep 2005
Posts: 1884

Kudos [?]: 379 [0], given: 0

Re: ps - last digit [#permalink]

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11 Dec 2005, 07:55
christoph wrote:
When which of the seven digits in 452*36*17 is plus 1, the product will increase by less than 1000?
A. 1
B. 2
C. 5
D. 7
E. 4

Sorry, I would explain it more clearly:
452*36*17 = 904*18*17
If adding 1 to 18 : the product will increase by 904*17 >> 1000 ( much much larger than 1000)
similar to adding 1 to 17
As we see, even we add 1 to the unit digits of 36 or 17, the product increases a lot more than 1000 ---> not to mention adding 1 to the tens digit of 38 or 17

Adding 1 to 2 of 452 , the product increases by 36*17 ( this product < 720 <1000) ---> satisfies

That's why B it is.

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SVP
Joined: 05 Apr 2005
Posts: 1707

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Re: ps - last digit [#permalink]

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11 Dec 2005, 08:30
it should be 2. lets add 1 to 452 =>that becomes 453.
453x (36x17) should increased by 36x17, which is less than 1000.

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SVP
Joined: 05 Apr 2005
Posts: 1707

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Re: ps - last digit [#permalink]

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11 Dec 2005, 08:32
laxieqv wrote:
That's why B it is.

laxi, do you only find OAs or also try to find harvard educated ones

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SVP
Joined: 24 Sep 2005
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Re: ps - last digit [#permalink]

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11 Dec 2005, 08:34
HIMALAYA wrote:
it should be 2. lets add 1 to 452 =>that becomes 453.
453x (36x17) should increased by 36x17, which is less than 1000.

have you get the same answer ... feel supported now

Are you now in Nepal,sis?! ....it must be very cold there, right?!

Kudos [?]: 379 [0], given: 0

SVP
Joined: 24 Sep 2005
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Kudos [?]: 379 [0], given: 0

Re: ps - last digit [#permalink]

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11 Dec 2005, 08:36
HIMALAYA wrote:
laxieqv wrote:
That's why B it is.

laxi, do you only find OAs or also try to find harvard educated ones

I prefer prospective Harvard guys ...have you been interested in any guys here, sis?!

Kudos [?]: 379 [0], given: 0

SVP
Joined: 05 Apr 2005
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Re: ps - last digit [#permalink]

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11 Dec 2005, 09:04
laxieqv wrote:
HIMALAYA wrote:
it should be 2. lets add 1 to 452 =>that becomes 453.
453x (36x17) should increased by 36x17, which is less than 1000.

have you get the same answer ... feel supported now
Are you now in Nepal,sis?! ....it must be very cold there, right?!

ok, prospective hvd is also ok...

therefore, i want to make warm the cold weather. do you remember this one from Bryan Adams:

lets do something amazing..........
make a night, sweet surrender
lets do someing............

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Re: ps - last digit   [#permalink] 11 Dec 2005, 09:04
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