The number of different four - digit num...

The number of different four - digit numbers that can be formed with the digits 2, 3, 4, 7 and using each digit only once is

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Consider all the six digit numbers that can be formed using the digits 1, 2, 3, 4, 5 and 6, each digit being used exactly once. Each of such six digit numbers have the property that for each digit, not more than two digits smaller than that digit appear to the right of that digit. Q. Number of such six digit numbers having the desired property is :

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