Question

2. If 21, a, b and
value of (a + b).
3 are in AP, then find the value of ( a+b)​

Answer 1

Answer:

a-21=d eqn1 where d is the common difference of AP

b-a=d eqn2

-3-b=d eqn3

RHS OF EQN 1 and 3 are same so a-21=-3-b so a+b=-3+21=18

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