Posted by payal on Tuesday, October 13, 2009 at 7:08am.
Assuming you are working with arithmetic sequences,
term(4) = a+3d = 20
term(7) = a+6d = 32
subtract the two equations:
3d = 12
d = 4
sub back into either top equation to find a
term(n) = a + (n-1)d
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