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- How many 3 digit numbers can we make using the digits 4, 5, 7 and 9 and where repetition is allowed?
- How many different seven digit telephone numbers are possible if the first digit can t be 1 or 0?
- How many different whole numbers can be made with the digits 2,5,8?(it can have 1,2,3digits in it. But a digit may not be repeated?
- 3 different digits constructed from digits 0 to 9 using a digit once only. How many such numbers can be construxted, end in 5,end in 0?
- What seven digit number is made up of 2s and 3s and is divisible by 12?