# Mathematics

How many 10 digit numbers can be formed using only the digits 2 and 5?

1. 👍 0
2. 👎 0
3. 👁 116
1. well, for each digit position you would have 2 choices
Number of such numbers containing only 2 and 5
= 2^10

1. 👍 0
2. 👎 0

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