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16 September, 23:12

9 mountain bikers are on bicycle trip in how many possible ways can they follow each other

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Answers (2)
  1. 17 September, 00:37
    0
    We could have 9 ways to pick the leader x 8 ways to pick the second place rider x 7 ways to pick the third place rider, etc.

    So

    9 x 8 x 7 x ... x 3 x 2 x 1 = 9! = 362880 ways to arrange them
  2. 17 September, 01:56
    0
    Ok one way is slot method

    9 slots

    1st slot-9 possible people

    2nd slot - 8 people (1 went to 1st slot

    3rd slot-7

    4th - 6

    5th - 5

    6th - 4

    7th - 3

    8th-2

    9th-1

    so multiply them

    9*8*7*6*5*4*3*2*1 = 362880

    362,880 ways
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