1.

Both 11 and 12 maths​

Answer»

Answer:

11. b

let 3 terms be a-d, a, a+d

then a-d + a + a+d = 21

3a = 21

a = 7

12. c

\alpha \times \frac{1}{ \alpha } = \frac{c}{a}

So, r/p = 1

then p=r


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