Permutation: n Different Things Taken All at a Time When All Are Not Different.
The number of...
Question
The number of numbers between 300 and 700 that can be formed using the digits 1,2,3,4,5, and 6 without repetition is
A
6
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B
12
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C
80
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D
120
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Solution
The correct option is C 80 In hundreds place, there are four digits that can be placed 3, 4, 5,6. In tens place "5," and in units place "4" digits. Therefore, Number of numbers between 300 and 700 = 4 x 5 x 4 = 80