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ps - last digit

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ps - last digit [#permalink] New post 11 Dec 2005, 06:16
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A
B
C
D
E

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0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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
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Re: ps - last digit [#permalink] New post 11 Dec 2005, 06:47
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.
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Re: ps - last digit [#permalink] New post 11 Dec 2005, 06:55
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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Re: ps - last digit [#permalink] New post 11 Dec 2005, 07:30
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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Re: ps - last digit [#permalink] New post 11 Dec 2005, 07:32
laxieqv wrote:
That's why B it is.

laxi, do you only find OAs or also try to find harvard educated ones :wink:
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Re: ps - last digit [#permalink] New post 11 Dec 2005, 07:34
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 :wink:

Are you now in Nepal,sis?! ....it must be very cold there, right?!
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Re: ps - last digit [#permalink] New post 11 Dec 2005, 07:36
HIMALAYA wrote:
laxieqv wrote:
That's why B it is.

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


I prefer prospective Harvard guys :roll: ...have you been interested in any guys here, sis?! :wink:
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Re: ps - last digit [#permalink] New post 11 Dec 2005, 08:04
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 :wink:
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............ :kiss
Re: ps - last digit   [#permalink] 11 Dec 2005, 08:04
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