Question

find the nth term in 6,12,18,24

Answer 1

Answer:

Here,

First term (a)= 6

common difference (d)= 6

Last term ( TN ) = 120

a + ( n - 1) × d = 1 2 0

6 + ( n - 1) × 6 = 120

6 + 6n - 6 = 120

6n = 120

n = 60

Therfore ,

Sn = n/2 × ( first term + last term)

= 10 × 126

Ans = 1260

Ans = 1 2 6 0