Find the sumof the series 51+50+49+….+21...

Find the sumof the series 51+50+49+….+21

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Find the sumof the series 51+50+49+….+21
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यदि 38 # 49 = 24 तथा 96 # 51 = 21 हो , तो 87 # 78 = ?
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51^(2)-49^(2)=
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