Find (70^2-69^2 )+ (68^2-67^2 )+ (66^2-65^2 )+ . .+ (2^2-1^2 ) - Vidyadip

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Find $\left(70^2-69^2\right)+\left(68^2-67^2\right)+\left(66^2-65^2\right)+\ldots \ldots . .+\left(2^2-1^2\right)$

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