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Assuming the question refers to the digits 1, 2, ... , 9 the answer is 1344 numbers.

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Q: How many even number of 4 digits can be formed out of digits 12.9 if repition of digit is not allowed?
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How many 6-digit numbers can be formed using the digits 23456 and 8 with repition?

Order does matter in this case so you need to use the formula for a Permutation with repetition allowed. This would be n^r where n=6 different numbers and r=6 possible places for each number to go when forming the full 6-digit number. 6^6 = 46,656 possible digits


How many 5 digit number can be formed using the digits 02345when repetition is allowed such that the number formed is divisible by 2 or 5 or both?

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How many 5 digits can be formed using the digits 0 2 3 4 5 when repetition is allowed that the number formed is divisible by 2 and 5 or both?

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How many three digits number can be formed out of the number 3 and4 and 5 if repetition of digits is not allowed?

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How many 7 digit numbers can be formed with the first two digits odd and the last five digits even if repition of digits is allowed?

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How many 9 digit numbers which are divisible by 4 can be formed by using the digits 1 to 5 if repetition of digits is not allowed?

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If a number with two digits is equal to four times the sum of its digits the number formed by reversing the order of the digits is 27 greater than the given number what is the number?

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Is a number with two digits is equal to four times the sum of its digits the number formed by reversing the order ofthe digits is 27 greater than the given number what is the number?

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When multiplying significant digits what is the number of digits allowed in an answer?

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.