3.2n  - 4.2n-2  = কত ?  

A  2n+1 

B  2n-1 

C  3 

D  2n 

Solution

Correct Answer: Option A

3.2n  - 4.2n-2  
= 3.2n  - 4.2n.2-2
= 3.2n  - 4.2n/22
= 3.2n  - 2n
= 2n(3-1)
= 2n.2
=2n+1

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