Permutations And Combinations Question 344
Question: Let $ 1\le m<n\le p. $ The number of subsets of the set $ A={1,2,3,…p} $ having m, n as the least and the greatest elements respectively, is
Options:
A) $ {2^{n-m-1}}-1 $
B) $ {2^{n-m-1}} $
C) $ {2^{n-m}} $
D) $ {2^{p-n+m-1}} $
Correct Answer: B
Show Answer
Answer:
Solution:
BETA
