1+5+9+13+…….. ধারাটির ১৫ তম পদ হবে?

A    61

B    53

C    57

D    65

Solution

Correct Answer: Option C

 

It's an arithmetic Progression.

a= 1, 

d= 5-1=4

nth term =a + (n-1)d

= 1+ (15-1)*4 = 57

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