Current location - Loan Platform Complete Network - Foreign exchange account opening - A number in the shape of "14352" is a five-digit wavy number. There are several ways to divide the five-digit wavy number composed of "1234567"
A number in the shape of "14352" is a five-digit wavy number. There are several ways to divide the five-digit wavy number composed of "1234567"

The only wave numbers formed by the five numbers 12345 are

14253, 14352, 24153, 24351, 34152, 34251, and reverse numbers.

13254, 23154, and reverse numbers

That is, for any 5 different numbers ABCDE, (6+2)*2=16 wave numbers can be formed.

Take 5 numbers from 1, 2, 3, 4, 5, 6, 7: C(7,5) = 7*6/2 = 21 kinds

Then The number of such waves***21×16 = 336 types

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