Probability and statistics


#1

Four six sided dice are rolled.The probability that the sum of the results is being 22 is x/1296.What is the value of x?


#2

See X1 +X2+X3+x4=22 since 4 dices will be rolled solve the above and find number of solutions that would be the answer. I got 21C4 i.e 5985


#3