Question

How many 3-digit numbers can you write using only digits 1, 5, and 7 if you cannot use the same digit twice?

Answer 1

You can make six 3-digit numbers with 1, 5, 7 if you cannot repeat the same digit more than once.

Explanation:

Since, we've 3 numbers & we need to create 3-digit numbers, each number should be in the hundreds, tens & ones place at least twice. So, the numbers that we get are:

• 157

• 751

• 517

• 175

• 715

• 571

•°• We'll get six numbers.

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Hope it helps!

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