Question

Sum of n terms is 2n^2+2 then 17th term is

Answer 1

Step-by-step explanation:

some of n term = 2n^2 +2

so...

when n = 1

s1 = a = 6 ........... (1)

S2 = a+(a+d) = 18

2a + d = 18

2×6 + d = 18 {from eq. (1) }

d = 18 - 12

d = 6 ....... (2)

Now the 17th term of the Ap is

a17 = a + (17 -1) d

a17 = 6 + 16×6 { from eq. (1) and(2) }

a17 = 6 + 96

a17 = 102 ...............