# permutation and combination

3 Results

## There are 52 cards in a standard deck. How many 5-card hands are possible if the cards are all hearts?

Explanation: This is a combinations question. The number of ways you can combine n objects taken r at a time is given by: Although there are 52 cards in a […]

## How many 4-digit numbers can be formed from the digits 1, 3, 4, 5, 6 and 7 , if repetition of the digit is not allowed?…

We have 6 digits available. There are 3 ways to fill the first digit (5,6,7) 5 ways to fill the second digit 4 ways to fill the third digit

## How many 3 digits numbers can be formed from the digits 1,2,3,4,5 and 6 if repetition of the digit is allowed and if repetition of the digit is not allowed?

The first digit can be selected in six ways; and another digit can also be selected in six ways Including the third digit increases

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