Question

MUTATIONS AND COMBINATIONS
PERMUTATIONS
n!
Prove that non - 1)(n - 2)......(n-r + 1) =
(n-r)!
n!
n!
(n-r)!"
6. Prove that (n - r + 1)
(n-r+1)!
(n-1)!
7. Prove that incr-1)!
tru
(n-1)!
(n-r)!
nl
(n-r)!
1
1
x
8.11 10: u
find​

Answer 1

Answer:

kuchh bhi questions haa