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Earn +20 ptsQ: How many different three-letter initials can people have?
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How many different five-letter initials with none of the letters repeated can people have?
There are 26*25*24*23*22 = 7,893,600 sets of initials.
How many different two-letter initials with none of the letters repeated can people have?
26*25 = 650
How many people around the world share the same birthday as you?
A person shares their birthday with at least nine million different people around the world.
How many different three member committees can be formed from a group of twenty-five people?
There are 2300 possible combinations.
How many different four-letter initials are there that begin with A?
26^3. There are 26 possible letters, so that is why we multipy by 26. Because there are 4 positions, and the first is taken with "A", that only leaves 3 positions left. As there are 26 possible letters in each position, you multiply by 26 three times, or, 26 to the third power.
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