Question

Which term of A.P : 21, 18, 15.......is Zero?
Ans step by step....
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Answer 1

=A.P = 21 , 18 , 15

=a = 21

=d = 18 - 21 = -3
= 15 - 18 = -3

=a , a+d , a+2d , a+3d , a+ 4d , a+5d , a+6d , a+7d

=21 , 21 + (-3) , 21 + 2 × (-3) , 21 + 3 × (-3) , 21 + 4 × (-3) , 21 + 5 × (-3) , 21 + 6 × (-3) , 21 + 7 × (-3)

21 , 18 , 15 , 12 , 9 , 6 , 3 , 0

Hence , the 8th term is 0


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