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Approach ?

by kamu » Wed Mar 11, 2009 3:08 pm
Is the square root of the integer x an integer?

(1) The last digit of x is 2.
(2) x is divisible by 3.

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Source: — Data Sufficiency |
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by scoobydooby » Wed Mar 11, 2009 9:29 pm
square root of the integer x an integer?

1) The last digit of x is 2
=>x not an integer. (no integer squared would give the last digit as 2, all squares end with 0,1,4,5,6,9)
sufficient


2) x is divisible by 3
=> x can be 3,6,9,12....all multiples of 3
if x=6, sq root of 6 not an integer
if x=9, sq root of 9 is an integer
not sufficient

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