Question

find the sum of first twenty four terms of arthemetic series 5+8+11+14.........using suitable formula​

Answer 1

Answer:

948 is the correct answer

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a=5,d=3,n=24

sum of n terms in AP = [n/2][2a+(n-1)d]

=>[24/2][2(5)+(24-1)(3)]

=>[12][10+69]

=>12×79

=>948

Answer 2

Answer:

1st term = 5

cd = 3

S= (24/2)(2×5 +(24-1)×3)

=12×(10 +69)

=12×79

=948 Ans