Prove that
( 1 +C (3, 1) + C (4, 2) = C (5,3)
(i) C(2,1)+C (3, 1) + C(4,1)=C (3, 2) +C (4,2)
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Find r,if 11c4+11c5+12c6+13c7=14cr
https://brainly.in/question/14451378
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