Question: nCr = n ! r ! ( n r ) ! calculates the number of ways you can choose exactly r successes in n trials.

nCr = n ! r ! ( n r ) ! calculates the number of ways you can choose exactly r successes in n trials. Use a calculator or calculate by hand the number of ways to choose exactly 7 success in 10 trials. On the TI 83/84: Type in the number of trials. Select MATH, scroll right to highlight PRB, select nCr (or aCb) Type in the number of successes. Enter

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