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How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?
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Question 2
There are ten steps in a staircase and a person has to take those steps. At every step, the person has got a choice of taking one step or two steps or three steps. The number of ways in which a person can take those steps is
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| Question Text | How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated? |
