Question

which term of the AP 21,18,15,....is zero​

Answer 1

Step-by-step explanation:

a=21,d=(-3),an=0

an=a+(n-1)d

0=21+(n-1)(-3)

-21/(-3)=n-1

7+1=n

n=8

Answer 2

HEYA MATE

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HERE IS YOUR ANSWER

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A.P. => 21, 18, 15, .....

a(first term) = 21

d(common difference) = a2(second term) h A1(first term)

18 - 21 = -3

let nth term of the A.P. is 0

=> an = 0

A.T.Q.

an = a + (n-1)d

=> 0 = 21 + (n-1)(-3)

=> 0 - 21 = (n-1)(-3)

=> -21 = (n-1)(-3)

=> -21/-3 = n-1

=> 7 = n-1

=> 7 + 1 = n

=> 8 = n

Therefore, 8th term of the A.P. is 0

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HOPE IT HELPS YOU

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