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In the inductive step, kCr + kC(r-1) is replaced by
A(k-1)Cr
B2 x kCr
CkC(r+1)
D(k+1)Cr
Answer & Solution
Correct answer: D. (k+1)Cr
Pascal's rule states that kCr + kC(r-1) = (k+1)Cr.
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