Question

find the sum of first 24 terms of an ap whose and term is given by a n is equal to 3 + 2n​

Answer 1

it's answer is 672...
put one at the place of n
and the value will come 5
put 24 at the place of n and the value will come 51...

Answer 2

a n= 3+2n

a1 = 3+2(1)

= 5

a2=3+2(2)

= 3+4=7

d=a2-a1

= 7-5=2

S24= 24/2(2a+(n-1)d)

= 12(2(5)+23×2)

= 12(10+46)

= 12(56)

= 672.

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