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From numbers (1) to (15), how many ways are there to choose (2) odd and (1) even number?

Answer and explanation

Correct answer: 196

From 1 to 15, there are 8 odd numbers: 1, 3, 5, 7, 9, 11, 13, 15, and 7 even numbers. The number of ways to choose 2 of the 8 odd numbers is \(\binom{8}{2}=28\), and the number of ways to choose 1 of the 7 even numbers is \(\binom{7}{1}=7\). Therefore, the total number of ways is \(\binom{8}{2}\binom{7}{1}=28\times7=196\). The value 224 can result from an incorrect count. Exam tip: multiply combinations when selections are made independently from separate groups.

Related tags

CombinationsPermutations And CombinationsOdd NumbersEven NumbersClass 11 MathematicsMathematicsClass 11 Mcq

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