# arithmetic

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4th &7th term is 20 & 32 , find a ,d & nth

• arithmetic -

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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