Question

What is the common difference of an A.P. in which
a
21 -a
7
= 84 ?need the pic of solution.

Answer 1

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Answer 2

Let `T_(n) = 210."Then," 21 + (n-1) xx 21 = 210`

`therefore (n-1) xx 21 = 189 rArr n - 1 = 9 rArr n = 10`