1.

1 реж рен00) el B BN KL. b N oniadie Jeren

Answer»

We know a, b, c are in AP then 2b = a + c

So, here

2(2k - 1) = k + 9 + 2k + 7

4k - 2 = 3k + 16

4k - 3k = 16 + 2

k = 18



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