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CBSE Class 12-science Answered

permutation and combination
Asked by deepak.embedded | 25 Mar, 2010, 10:06: PM
Expert Answer

The natural numbers that satisfy the condition are,

1, 5, 9, 13, 17, 21.

Hence there are 6 ways to select first number.

5 ways to select second.

4 ways to select third.

3 ways to select fourth.

2 ways to select fifth.

Hence the number of ways = 6P5 = 6x5x4x3x2 = 720

Regards,

Team,

TopperLearning.

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