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Earn +20 ptsQ: How many 2-digit numbers contain the digit 7 only once?
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Continue Learning about Math & Arithmetic
How many 2 digit numbers contain the digit 4?
17
How many 4 digit numbers contain the digit 5?
There are 9000 4-digit numbers. 8*9*9*9 = 5832 of them do not contain a 5 The remaining 3168 contain a 5.
How many a 2 -digit numbers contain the digit 4?
-2
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 3 digit numbers contain the digit 2 at least once?
252
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