Question

a=2, b=3, Sn=242, find n=?​

Answer 1

Answer:

Sn=n/2(2a+(n-1) d)

Step-by-step explanation:

242=n/2(2*2+(n-1)3 , 242=n/2(4+3n-3) 242*2=n(1+3n) 484=n+3n^2 3n^2+n-484=0