(a/b)^a/b = a^(a/b)-1 এবং a = 2b হলে, b এর মান কত ?

A 2

B 1/2

C 1/4

D -2

Correct Answer: Option A

(a/b)^a/b = a^{(a/b)-1}
=> (2b/b)^2b/b = (2b)^{(2b/b)-1}
=> (2)^2 = (2b)^(2-1)
=> 4 = 2b
b = 2