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The nth term of an AP is (7-4n) . . .

Question : The nth term of an AP is (7-4n), then what is its common difference?


Doubt by Ziya 

Solution : 
an=7-4n

Putting n=1
a1=7-4(1)
a1=7-4
a1=3

Putting n=2
a2=7-4(2)
a2=7-8
a2=-1

Common difference
d=a2-a1
d=-1-(3)
d=-4
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