Question

The number of different ways of preparing a garland using its 6 red roses and 3 yellow roses such that no 2 yellow roses come together is​

Answer 1

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The number of ways of arranging the letters AAAAA,BBB,CCC<D,EE and F in a row if the letters C are separated from one another is:

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If

9

P

5

.

9

P

4

=

10

P

r

. Find r.