SHORT AND SWEET

Probability Level 2

The number of 5-digit numbers that can be made using the digits 1 and 2 and in which at least one digit is different , is:


The answer is 30.

Pankaj Joshi by Pankaj Joshi , 23, India

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1 solution

Pankaj Joshi
Mar 1, 2014

There are 5 blanks each of which can be filled with 2 digits.

So total no. of numbers that can be formed are 2 5 2^5 .

But here we have also included the numbers 11111 11111 and 22222 22222 .

So the required answer shall be 32 − 2 = 30 32-2 = 30

3 Helpful 0 Interesting 0 Brilliant 0 Confused

Kindly phrase your question properly

Krishna Ar - 7 years ago

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