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Earn +20 ptsQ: How many 2 digit numbers?
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How many a 2 -digit numbers contain the digit 4?
-2
How many 2 digit numbers contain the digit 4?
17
How many 2-digit numbers contain the digit?
It would help to know which digit. 0 appears in 9 numbers and each of the others in 18 numbers.
How many 2-digit numbers contain the digit 7 only once?
-5
How many different 2 digit numbers can be formed from the digits 2 6 7 and 8?
Without repeats there are 4 × 3 = 12 possible 2 digit numbers. With repeats there are 4 × 4 = 16 possible 2 digit numbers.
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