3.2n -4.2n-2 = কত ?
A 2n
B 2n+1
C 2n-1
D 23
Correct Answer: Option B
3.2n - 4.2n-2
= 3.2n - 22 .2n-2
= 3.2n -22+n-2
= 3.2n - 2n = 2n (3-1) =2n .2 = 2n+1
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