Prove the identity. 1. nPn1 = nPn 2. nCn = nC0 3. nCn-1 = nC1 4. nCr
Question:
1. nPn−1 = nPn
2. nCn = nC0
3. nCn-1 = nC1
4. nCr = nPr / r!
5. Can your graphing utility evaluate 100P80? If not, explain why.
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