Lets see (1)
K is divisible by 4
when k=4 answer to the main question stem is yes
k=8 answer to the main question stem is no hence INSUFFICIENT
See(2)
K is divisible by exactly 4 different prime number. Lets say the 4 different prime numbers are 2,3,5 and 7
when k=2x3x5x7 answer to the main question stem is no
when k=2x2x3x3x5x5x7x7 the answer is yes hence INSUFFICIENT
both (1) and (2)
k=2x2x3x5x7 answer to main stem no
k=2x2x3x3x5x5x7x7 answer is yes INSUFFICIENT
GMAT prep 2 - Kpositive
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Source: Beat The GMAT — Data Sufficiency |
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radhaswami
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