Question 02/07/2013 3.12

How many different 7-place license plates are possible if the first 2 places are for letters and the other 5 for numbers?

Ans : 67 600 000

Question 12/31/2012 10:06

What is the probability that the arrangement has both consecutive W's and consecutive Y's in WYSIWYG?

Ans. 0.0952

Question 12/26/2012 5:58

A group of students consists of 4 boys and 4 girls. How many ways are there to select 2 students of same sex from the group.

Ans. 12

Question 12/25/2012 2012 7:23

In how many ways may fifty-two cards be divided amongst tour players, so that each may have thirteen ?

Ans. $\frac{52!}{(13!)^4}$

Question 12/25/2012 6:57

In how many ways can three boys divide twelve oranges, each taking four, the oranges being all of different sizes ?

Ans. 34650

Question 12/25/2012 5:45

Four flags are to be hoisted on one mast, and there are twenty different flags to choose from : what choice have we ?

Ans. 116280

Question 12/25/2012 4:22

Probability of n Heads in 2n Tosses of a Coin?

Ans. $\frac{(2n)!}{{(n!)^2}{2^{(2n)}}}$