# Which term of the AP 21, 18, 15, ... is zero?

Here first term = 21

Common difference = 18 - 21 = - 3

Let an be the term which is zero.

an = 0

a + (n - 1)d = 0

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

21 - 3n + 3 = 0

3n = 24

n = 8

8th term of the given AP will be zero.

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