Current location - Training Enrollment Network - Mathematics courses - 23456 Five numbers are arranged in five digits. There are no duplicates. How many odd numbers are arranged in odd numbers?
23456 Five numbers are arranged in five digits. There are no duplicates. How many odd numbers are arranged in odd numbers?
Five digits1; 3; Five digits are odd.
And the odd numbers of 23456 are 2 and 5.
Then there are three spaces to put two odd numbers, and the other three positions are 2; 4; 6. Let it go
The total number is A33 times A32 = 3× 2×13× 2 = 36.