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
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Team,
TopperLearning.
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