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5 votes
How many 6-digit binary strings have the property that their second and fourth digits are 1s?

User Vistari
by
7.7k points

1 Answer

3 votes
Fixing two of the bits leaves four remaining positions, each with two possibilities (0 or 1), so there are
2^4=16 possible strings.
User Vadim Berman
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7.8k points
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