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  4. The number of ways in which 6 red roses and 3 white roses can form a garland so that all the white roses come together is

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Q. The number of ways in which 6 red roses and 3 white roses can form a garland so that all the white roses come together is

Permutations and Combinations

Solution:

Reqd. no. of ways $=\frac{6!3!}{2!}=720\times3$
$=2160$