1.

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

Answer»

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



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