Question

find the sum of the first 15 terms of AP 5 8 11 14

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Answer 1

Answer:

8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59 62 65 68 71 74 77 80 83 86  89 92 95 98 101 .......

Step-by-step explanation:

Answer 2

Answer:

s₁₅= 315

Step-by-step explanation:

a=5

a+d=8

=5+d=8

=d=8-5

d=3

$S_{n}$ =n/2(2a+(n-1)d

s₁₅= 15/2*(2*5+(15-1)3

s₁₅= 15/2*(10+14*3)

s₁₅= 15/2(10+42)

s₁₅=15*42/2

s₁₅=15*21

s₁₅= 315

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