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Set 23 Q11

Expert replies
by kv_ajay » Mon Aug 25, 2008 9:39 pm
If x is a positive integer, is the remainder 0 when 3x + 1 is divided by 10?
(1) x = 4n + 2, where n is a positive integer.
(2) x > 4

OA: A

Please explain..

My answer is d - Not sure if 0 is considered as +ve integer. If not then B.
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Source: — Data Sufficiency |

by carefreeamit » Mon Aug 25, 2008 10:48 pm
Option 1-
3x + 1 = 3(4n + 2) + 1
= 12n + 7

Since 12n will always be even, 12n+7 will always be odd. i.e. not divisible by 0. --Sufficient

Option 2 - is not sufficient


Ans A
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by kv_ajay » Tue Aug 26, 2008 5:55 am
Thanks Amit.

I tried to do by filling values which is wrong way. That's why i missed this question.
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by Suyog » Tue Aug 26, 2008 6:33 am
ur approach is good enuf...

try 12 & 13, (II) is Insuff
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