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In how many ways can the letters O, R, D, E, and R be arranged so th

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BSchool Forum Moderator
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In how many ways can the letters O, R, D, E, and R be arranged so th  [#permalink]

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New post 06 Sep 2019, 06:30
1
2
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

58% (01:13) correct 42% (01:39) wrong based on 19 sessions

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In how many ways can the letters O, R, D, E, and R be arranged so that there are at least two letters between two "R"s?

(A) 12

(B) 18

(C) 24

(D) 36

(E) 60
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Re: In how many ways can the letters O, R, D, E, and R be arranged so th  [#permalink]

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New post 06 Sep 2019, 06:43
For two letters between two Rs we have:1)R,...,...,R,...1*3*2*1*1=6
2)...,R,...,...,R 3*1*2*1*1=6
And for three letters between two Rs, we have;
1*3*2*1*1=6
6+6+6=18
Option B

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Re: In how many ways can the letters O, R, D, E, and R be arranged so th   [#permalink] 06 Sep 2019, 06:43

In how many ways can the letters O, R, D, E, and R be arranged so th

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