How many 4 digits codes can be formed with odd numbers without repetition? 0 is not allowed.

Mathematics

1 answer:

Sliva [168]2 years ago

3 0

9514 1404 393

Answer:

120

Step-by-step explanation:

The number of permutations of 5 things taken 4 at a time is 120.

There are 5 odd digits. You want to choose 4 of them, then arrange those 4 in all possible ways. There are 5·4·3·2 = 120 ways to do that.

120 4-digit codes can be formed using odd digits with no repetition.

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A chemist would like to dilute a 90-cc solution that is 5% acid to one that is 3% acid. How much water must be added to accompli

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