Math, asked by chiragshelar0904, 3 months ago

in an ap a=15, t15= 85 find d and s15

Answers

Answered by amitsharma777222999

2

Answer:

a+14d=85

14d=85-15

14d=70

d=5

s15=15/2(30+14*5)

=15/2(30+70)

=15/2 *100

=15*50

=750

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