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Above number can have only 1 prime value = 3 and for it 3a-b=1 and b=0 is the condition

(1) 3a – b = 1 We don't know anything above b . so we dont know anything about the denominator Not sufficient

(2) b is an integer. Here we dont know value of a. and here b can take any value 0,1,2... Not sufficient

1+2 We get one condition to form prime number ie. 3a-b=1, but we don't know anything about b. b is an integer.. if b=0 than given number is prime number if b is any other integer than not a prime number.

Answer: E

gmatclubot

Is the value of 27^a/6^b a prime number? &nbs
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11 Sep 2017, 03:34