SATHEE: Permutations And Combinations Question 227

Permutations And Combinations Question 227

Question: The number of n digit numbers which consists of the digits 1 and 2 only if each digit is to be used at least once, is equal to 510 then n is equal to

Solution:

Answer: 9

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Permutations And Combinations Question 227

Question: The number of n digit numbers which consists of the digits 1 and 2 only if each digit is to be used at least once, is equal to 510 then n is equal to

Solution:

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