The sum upto (2n+1) terms of the series a^2-(a+d)^2+(a+2d)^2-(a+3d)^2+ , is

JEE Main Mathematics question

The sum upto terms of the series , is

Answer: (D)

Pair the first terms: $[(a+-(a+(2j+=-d[2a+(4j+1)d]=-2and--

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Question ID VK-021864