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How many four digit natural numbers not exceeding 4321 can be formed with the digits 1,2,3,4 if digits can repeat

How many four digit natural numbers not exceeding 4321 can be formed with the digits 1,2,3,4 if digits can repeat

Grade:11

1 Answers

Vikas TU
14149 Points
7 years ago
If numbers can repeat then
total combination would be => 2^4 = 256.
Now just subtract the no. of possibilites which are greater than 4321.
And hence that would be => 27.
Hence,
nos can be formed => 256 – 27 = > 229.

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