Math,PS

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ukr.net: Senior | Next Rank: 100 Posts; Posts: 46; Joined: Thu Nov 22, 2007 6:32 am

by ukr.net » Fri Nov 30, 2007 9:30 am

If y is the smallest positive integer such that 3,150 multiplied by y is the square of an integer, then y must be

2
5
6
7
14

ANS IS D ,why?

Source: Beat The GMAT — Problem Solving | Fri Nov 30, 2007 9:30 am

Suyog: Master | Next Rank: 500 Posts; Posts: 315; Joined: Thu Aug 17, 2006 10:43 pm; Thanked: 23 times

by Suyog » Fri Nov 30, 2007 10:33 am

3150 = 2 * 3 * 3 * 5 * 5 * 7

to make this number a perfect square, the number shud be multiplied by 14 i.e. 7 * 2

Ans shud be E

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