Question

which term od AP 21,18,15,......is - 81?state with reason if there is any term 0 in this AP​

Answer 1

Answer:

In this series first term is a = 21

common difference d = 18 - 21 = - 3

Let nth term be 0

$a + (n - 1)d = 0 \\ \\ 21 + (n - 1)( - 3) = 0 \\ \\ 21 - 3n + 3 = 0 \\ \\ 3n = 24 \\ \\ n = 8$

Since n = 8 is an integer so term 0 is possible .

Answer 2

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