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3 years ago

5

Q # 15 please help to solve

1 answer:

viktelen [127]3 years ago

4 0

We know that
the formula for combinations is
nCr=n!/[(n-r)!*r!]
n is the total number of objects
r is the number that you choose to arrange

in this problem
n=5
r=2
C=5!/[(5-2)!*2!]------> C=5!/[(3)!*2!]-----> C=5*4*3!/[3!*2!]
C=20/2----> C=10 ways

the answer is
10 ways

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