Question

find the sum of first 24 terms of the list of numbers whose nth term is given by An=3+2n

Answer 1

A24 =24th term
A24=3+2(24)
A24=51

Answer 2

t1=5
t2=7
t24=51

sum=n/2(t1+t24)
=12(5+51)
=12(56)
=672

I hope it will help you