If the permutations of a, b, c, d, e taken all together be written dowan in alphabetical order as in dictionary and numbered then the rank of the perm

Question

If the permutations of a, b, c, d, e taken all together be written dowan in alphabetical order as in dictionary and numbered then the rank of the perm

If the permutations of a, b, c, d, e taken all together be written dowan in alphabetical order as in dictionary and numbered then the rank of the permutation debac, is
A. 90
B. 91
C. 92
D. 93

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - D
The letters in alphabatical order are abcde
`a to 4!=24`.
`b to 4!=24" "dc to 3!=6`
`c to 4!=24" "dea to 2!=2`
`da to 3!=6 " becac"to1`
`therefore`The rank of debac=24+24+24+6+6+6+2+1=93

4 views Answered 2023-02-05 15:29