Question

Find the sum of n terms of the series 1, 2, 3,6 17, 54, 171.....​

Answer 1

Step-by-step explanation:

a = 1

d = a^1 - a^2

d = 2 - 1

d = 1

an = 171

an = a+ (n-1)×d

171 = 1+(n-1)×1

171 = 1+ 1n× 1

171 = 2+ 1n

171 - 2= 1n

169 = 1n

169÷ 1 = n

169 = n

Answer 2

Answer:

is this shivli from gravity??