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Find r if 11C4 + 11C5 + 12C6 + 13C7 = 14Cr .

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Find r if 11C4 + 11C5 + 12C6 + 13C7 = 14Cr .

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11C4 + 11C5 + 12C6 + 13C7 = 14Cr 

\(\therefore\) r = 7 or r = 14 - 7 = 7

\(\therefore\) r = 7

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