Question

The number of terms in the series is.

• A. 25
• B. 28
• C. 30
• D. 20

Answer 1

Answer: (B)

28

Answer 2

Given series

So, first term $a = 101$, common difference $d = - 2$ and last term $l = 47$

We know that last term of a series

$T _ { l } = a + ( n - 1 ) d \Rightarrow 47 = 101 + ( n - 1 ) ( - 2 )$

$\Rightarrow$ $- 54 = ( n - 1 ) ( - 2 ) \Rightarrow n = 28$.