Question

find 9th term of Ap -21,-17,-13​

Answer 1

Answer:

From the following AP

first term = a = -21

common difference = d = -17 -(-21) = -17+21 = 4

Ninth term = a 9 = a +8d = -21 + 8 (4)

= -21+32

= 11

Explanation:

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