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Grade 12th passAlgebra

IN the following question ,the answer of the sum given belowi s: 20c1+21c1+22c1+24c1+25c1+26c1+27c1+28c1+29c1+30c1

Profile image of anshuman rai
9 Years agoGrade 12th pass
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1 Answer

Profile image of Archit Archyut
9 Years ago
nc1=n
therefore,20c1+21c1+22c1+23c1+34c1+25c1+26c1+27c1+28c1+29c1+30c1
=20+21+22+23+24+25+26+27+28+29+30=275

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