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