There are 5 stars and 4 bars to be arranged in the 9 spaces pictured below. One possible arrangement is shown.
有多少毫无ible arrangements are there?
byAndy Hayes
Find the number of positive integer solutions of the equation
byVighnesh Raut
Find the number of 8-digit numbers the sum whose digits is 4.
byVaibhav Prasad
How many (positive) seven digit integers are there that have a digit sum equal to and that are formed using only the digits , and ?
byArpit Dhimanj
There are 20 distinct people signed up for a raffle. There are 3 prizes that can be won: a 100 cm HDTV, a signed football jersey, and an envelope filled with gift cards. It is possible for a person to win more than one prize.
有多少毫无ible prize distributions are there?
byAndy Hayes