Tatiana is a counselor at summer camp. She wants to take 20 campers on a hike and wants to choose a pair of students to lead the way. In how

Question

Tatiana is a counselor at summer camp. She wants to take 20 campers on a hike and wants to choose a pair of students to lead the way. In how many ways can Tatiana choose this pair of children?

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Lydia 2 weeks 2021-09-11T23:53:05+00:00 1 Answer 0

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    2021-09-11T23:54:25+00:00

    Answer:

    There are 190 ways to choose this pair of children

    Step-by-step explanation:

    Total number of students at summer camp = 20

    Tatiana wants to choose a pair of students to lead the way

    Number of students in a pair = 2

    We are supposed to find In how many ways can Tatiana choose this pair of children

    So, We will use combination

    Formula :^nC_r=\frac{n!}{r!(n-r)!}

    n = 20

    r= 2

    So,^nC_r=\frac{n!}{r!(n-r)!}=\frac{20!}{2!(20-2)!}=190

    Hence There are 190 ways to choose this pair of children

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45:7+7-4:2-5:5*4+35:2 =? ( )