Find the A.M. between: (i) 7 and 13 (ii) 12 and – 8

Answers:

(i)

A be the Arithmetic mean

7, A, 13 are in AP

A-7 = 13-A

2A = 13 + 7

A = 10

(ii)

A be the Arithmetic mean

12, A, – 8 are in AP

A – 12 = – 8 – A

2A = 12 + 8

A = 2