MathRevolution wrote:

Is a positive integer n a multiple of 12

1) n is a multiple of 6

2) n is a multiple of 24

St I

n is a multiple of 6

n can be 6,12,18,24,.... where 6,18,... are not multiples of 12 ------- Insufficient

St II

n is a multiple of 24

which means n is a multiple of 12*2

n will be of the form 12*2*1, 12*2*2, 12*2*3....

so n will be a multiple of 12 --------- Sufficient

Hence option B is correct

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