Compute the permutations and combinations.

how many two-digit, positive integers can be formed from the digits 1, 3, 5, and 9, if no digit is repeated?

a. 12
b. 16
c. 24

Permuation is no repeats
that is n!
2 digits
with the 4 numbres
so
first number can be 4 possible numbers
2nd can be 3 because 1 has been used

so 4*3=12
12 is answer
A is answer

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.

The difference is 5,100m?