Question

what is the sum of the first 10 terms of AP 15,10,5.....​

Answer 1

$sum \: of \: 10 \: terms \: of \: ap \: is \: - 75$

Answer 2

Answer:

a=15,d=-5

a. =15

a+d =15+(-5)=10

a+2d=15+2(-5)=5

a+3d=15+3(-5)=0

a+4d=15+4(-5)=-5

a+5d=15+5(-5)=-10

a+6d=15+6(-5)=-15

a+7d=15+7(-5)=-20

a+8d=15+8(-5)=-25

a+9d=15+9(-5)=-30

sum of 10 terms of ap=15+10+5+0-5-10-15-20-25-30=-75

Step-by-step explanation:

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