Find the A.P, if second term and fifth term are respectively 28 and 49.
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Second term of ap
a+d=28.......(1)
Fifth term of ap
a+5d=49......(2)
eqn(1)-eqn(2)
a+d=28
a+5d=49
(-) (-). (-)
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- 4d=-21
d=-21/-4
Substitute d=21/4
a+21/4=28
a=48/1-21/4
a=4×48-1×21/4
a=192-21/4
a=168/4
a=42
First term a=42
Second term a2=28
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