Who is the guard?

Probability Level 1

10 members went for a picnic. In how many ways 2 guards can be chosen?

45 20 80 90

Vishwathiga Jayasankar by vishwathiga jayasankar , 20, India

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2 solutions

N = N= 10 C 2 = 45 10C2=45

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Freddie Hand
Jan 8, 2017

The number of ways to choose two guards out of ten people is 10 ! 8 ! 2 ! = 45 \dfrac{10!}{8!2!}=45

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