please solve 12.......
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Sn = {4-1/n}+{4-2/n}+{4-3/n}....till nth term
= { 4+4+......+4}-1/n(1+2+3...+n)
=4n-1/n×n(n+1)/2
=7n-1/2....
7n-1/2 is the req....nth term
= { 4+4+......+4}-1/n(1+2+3...+n)
=4n-1/n×n(n+1)/2
=7n-1/2....
7n-1/2 is the req....nth term
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