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2016-01-07T20:57:55+05:30

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Nth term =7-4n
1st term=7-4=3
2nd term=7-4x2=-1
hence d=-1-3=-4
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2016-01-07T21:46:40+05:30

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Nth term of AP is 7-4n
d = an - an-1 = (7-4n)- [ 7- 4(n-1) ]
= (7-4n)-(7-4n+4)
=7-4n-7+4n-4
=-4
Common difference is -4
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