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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.
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 descending numbers are there?
There are 45 such numbers.
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 digit 1?
1
How many 2 digit odd numbers are there?
45
How many odd 2-digit numbers are there?
45 of them.
How many 2 digit prime numbers are there whose unit digit is greater its tens digit?
Ten.
How many two digit numbers are not multiples of 2?
All of the odd numbers between 11 and 99 inclusive are two digit numbers that are not multiples of 2. There are 45 of them.
How many 2 digit numbers which are a perfect a square have their last digit as 8?
none
How many 2-digit numbers contain the digit 7 only once?
-5
How many 5 digit combinations for numbers 1- 25?
There are 9 1-digit numbers and 16-2 digit numbers. So a 5 digit combination is obtained as:Five 1-digit numbers and no 2-digit numbers: 126 combinationsThree 1-digit numbers and one 2-digit number: 1344 combinationsOne 1-digit numbers and two 2-digit numbers: 1080 combinationsThat makes a total of 2550 combinations. This scheme does not differentiate between {13, 24, 5} and {1, 2, 3, 4, 5}. Adjusting for that would complicate the calculation considerably and reduce the number of combinations.
