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Re: What is the least possible product of 4 different integers, each of [#permalink]

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17 Mar 2011, 02:22

greatest product is 10X9X8X7. In negative greater the abs value lesser the number is. so we remove 7, replace it with max possible abs value from the set (5) and put a negative sign that the 5 brought with it. ans -3600

Re: What is the least possible product of 4 different integers, each of [#permalink]

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17 Mar 2011, 21:10

Because we have to actually have a negative number in there, not just add a - sign at the end. As others said, we utilize -5 so we can change the sign of our product, and then we can go use our three largest numbers which are positive 10,9,8.

Re: What is the least possible product of 4 different integers, each of [#permalink]

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18 Mar 2011, 17:44

because -5040 is not possible.

the least we can get for the product here is (-5)*10*9*8 = -3600

if we choose one negative , three positive, least possible combination if we choose two negative and two positive , product becomes positive. hence wont be least possible. if we choose three negative and one positive -4*-3*-2*10 , possible combination , but wont give least possible. if we choose four negative , the product becomes positive . hence wont be least possible

trick is choose a largest possible negative integer .

Hence the answer is B.

Acer86 wrote:

Can someone please explain as to why we did not choose -5040?

Re: What is the least possible product of 4 different integers [#permalink]

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19 Jul 2014, 05:10

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Re: What is the least possible product of 4 different integers, each of [#permalink]

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09 Nov 2015, 23:50

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Re: What is the least possible product of 4 different integers [#permalink]

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10 Nov 2015, 03:38

Expert's post

Acer86 wrote:

What is the least possible product of 4 different integers, each of which has a value between –5 and 10, inclusive?

(A) –5040 (B) –3600 (C) –720 (D) –600 (E) –120

Point to be noted: Even number of negative integers multiplied gives us a positive integer and odd numbers of negative integers multiplied gives us a negative integer. Any number of positive integers multiplied, the result is always a positive integer

We need to find the least possible negative integer after selecting 4 "different" integers from -5 to 10 We can do it by multiplying the extremes and then putting other numbers in between.

Select -5 and 10. Now we need to maximize this. Since, we need different numbers, we can take 9 and 8

Hence the product = -5*8*9*10 = -3600 Option B _________________

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