Lecture Hall A lecture hall has five doors. In how many
ways can a student enter the hall by one...

Question

Lecture Hall A lecture hall has five doors. In how many
ways can a student enter the hall by one door and 

(a) Exit by a different door? 

(b) Exit by any door? 

Poker Hand A poker hand consists of 5 cards drawn from a
deck of 52 playing cards. The hand is said to be “four of a kind” if four of
the cards have the same face value. For example, hands with four 10’s or four
jacks or four 2’s are four-of-a-kind hands. How many such hands are possible?

Dr Shweta · Accepted Answer

Q.1 Lecture Hall A lecture hall has five doors. In how many ways can a student enter the hall by one door and
(a) Exit by a different door?
(b) Exit by any door?
Ans:
A) Number of entrance doors =5
If each student has to go out from a different door means he can go by 4 different doors 
So,

Lecture Hall A lecture hall has five doors. In how many ways can a student enter the hall by one door and (a) Exit by a different door? (b) Exit by any door? Poker Hand A poker hand consists of 5...

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