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Algebra Permutations And Combinations
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Q.
How many numbers less than 1000 can be made from the digits 1, 2, 3, 4, 5, 6 (repetition is not allowed)
A.
156
B.
160
C.
150
D.
166
E.
None of the above
View Answer
Correct choice: A
Explanation:
Number of 1 digit numbers =
6
p
1
Number of 2 digit numbers =
6
p
2
Number of 3 digit numbers =
6
p
3
The required number of numbers =6+30+120=156.
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