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  4. Number of natural numbers between 100 and 1000 that can be formed with the digits 1,2,3,4,5,6,7 if each digit is used atmost once is also equal to

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Q. Number of natural numbers between 100 and 1000 that can be formed with the digits $1,2,3,4,5,6,7$ if each digit is used atmost once is also equal to

Permutations and Combinations

Solution:

Correct answer is (b) the number of triangles that can be formed with 12 points in a plane with exactly 5 of them being collinearCorrect answer is (c) the number of ways in which 4 alike apples can be distributed in 10 children if each child gets at most one apple.Correct answer is (d) number of ways in which 10 different books can be tied up into two bundles one containing 2 more things than the other