1.

If a sequence {an} is defined as an=⎧⎪⎪⎨⎪⎪⎩1n,when n is odd−1n2,when n is even where n∈N, then the sum of first four terms is

Answer»

If a sequence {an} is defined as
an=

1n,when n is odd1n2,when n is even

where nN, then the sum of first four terms is



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