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We wish to select 6 persons …

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We wish to select 6 persons from 8, but if the person A is chosen, then B must be chosen. In how many ways can the selection be made?

    • Posted by Ash ✌️ 5 years, 7 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Ash ✌️ 5 years, 7 months ago

    Aur koi online hai

    0Thank You

    Ash ✌️ 5 years, 7 months ago

    We have two cases: (either A is chosen) or (A is not chosen). CASE-1. When A is chosen: In this case A is chosen and B is chosen. So, we must choose 4 persons out of remaining 6. required number of ways= 6^C⁴= 6^C²== 6×5/2×1=15 CASE-2. When A is not chosen: In this case, we have to choose 6 persons out of 7. required number of ways=7^C^6=7^C¹=7. Combining both the cases, we have: total number of ways=(15+7)=22

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