Find the value of n and r (with solutions)
1. C(5,r)=10
2. C(n,4)=35
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Find the value of n and r (with solutions)
1. C(5,r)=10
2. C(n,4)=35
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Answer:
n = 12 + 9. n = 21. 21Cn = 21C21 = 1. Hence the answer is 1. Question 2 : If 15C2r−1 = 15C2r+4, find r. Solution : If nCx = nCy ==> x = y (or) x + y = n.
Step-by-step explanation:
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