How many numbers lying between 100 and 1000 can be formed with the digits 0, 1, 2, 3, 4, 5, if the repetition of the digits is not allowed?

Question

TextPermutation Formula nPr

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

Find the value of n such that

Find r, if 5 4Pr = 6 5Pr–1 .

TextPermutation Formula nPr

Find the number of different 8-letter arrangements that can be made from the letters of the word DAUGHTER so that

How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?

How many 4-digit numbers are there with no digit repeated?