Question

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

Answer 1

Answer:

Step-by-step explanation:

If n=1,

a1=3+(2×1)

a1=3+2

a1=5.

So, a=5.

a2=3+(2×2)

a2=3+4

a2=7

d=a2-a1

d=7-5

d=2.

We know that an=a+(n-1)d

So,a24=5+(24-1)2

a24=5+23×2

a24=5+46

a24=51.

Sn=n/2(a+an)

S24=24/2(5+51)

S24=12×56

S24=672.

Hope it helps you.

Please mark as brainliest.