Question

3rd term of an AP is 21 and the 8th term is 56. find AP and also find its 11th term​

Answer 1

Answer:

77

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Step-by-step explanation:

a+2d = 21 ....eqn 1

a+ 7d = 56 ....eqn 2

eqn 2- eqn 1

5d= 35

d= 7

put d=7 in eqn 1

a+2*7= 21

a=21-14

a=7

eleven term = a+10d = 7+10*7 = 77.

A.p.= 7,14,21,28,35......