Question 856342
1)The b must appear in the first 23 letters. There are 23 different locations it can occupy. Each other letter has only 23 places that it can occupy also.
1/23 * 1/22 * 1/21 * 1/20 * 23 = 1/9240
.
2)
4!/26P4
=24/358800
1/14950
.
Ed