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11001.

To convert a decimal number to binary, we start with the highest power of two that goes into the decimal number once, and reduce from there.

For 25, we move forward as follows:

25 is first divisible by 16, so we get 1 and are left with 9

After 16, we check to see 8 and 9 can be divided by eight, getting us another 1

After 8, we are left with 1. 1 cannot be divided by 4 or 2, so we get two 0s.

Finally 1 is divisible by 1, giving us a 1.

Stringing what we found together, we get the following

1 1 0 0 1.

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Q: What is the decimal number 25 in binary?
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