Question

The sum of first 24 terms of the list of numbers whose nih term is a 3+2m (a) 642 (b) 6420 (c) 672 (d) None of these​

Answer 1

n = 24

Now,

S m - 1 = 5

S m -2 = 9

D = 4

A.P formed, 5,9,13.... Upto 24

So sum = 12 ( 10 + 92 )

12 ( 102 )

1200 + 24

Idk but I think it's none of these I think I am incorrect but still Okay..