Question

An ap has 4 terms. One is given. How to find sum of 4 terms

Answer 1

The sum of $4^{th}$ term of an ap is "2(a +  1)".

Step-by-step explanation:

Here, $a_{4}$ = 1, number of terms(n) = 4

Let a be the first term.

We know that,

$a_{n}$  = $\dfrac{n}{2}$ ·{a + $a_{4}$ }

= $\dfrac{4}{2}$·{a + 1 }

= 2(a +  1)

The value of a is not given.

The sum of $4^{th}$ term of an ap is "2(a +  1)".