nc12 =nc15 find nc26
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if ncr=ncs then r+s=n
nc12 =nc15 then 12+15=n
27=n
n=27
nc26
27c26
27c1
=27 is answer obtained
nc12 =nc15 then 12+15=n
27=n
n=27
nc26
27c26
27c1
=27 is answer obtained
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