if 5pr = 2, 6pr-1 find r
Answers
Answered by
0
Answer:
question is :
5
P
r
=2
6
P
r−1
nPx
=
(n−x)!
n!
(5−r)!
5!
=2×(7−r)!
6!
(7−r)(6−r)=4×3
r=3
Answered by
0
Answer:
r=3
Step-by-step explanation:
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