If a problem is solved. It is not 'the' answer.
No attempt is made to search for the most elegant answer.
I highly recommend that you at least try to solve the problem before you read the solution.
|In how many ways can you stack 7 different books, so that a specific book B is on the third place?|
|In how many ways can you take 3 marbles out of a box with 15 different marbles?|
|In a firm are 20 workmen and 10 employees. In how many ways can you construct a delegation with 3 workmen and 2 employees?|
|In how many ways can you take 5 cards, with at least 2 aces, out of a game of 52 cards?|
|In how many ways can you split a group of 13 persons in 3 persons and 10 persons?|
|How many diagonals are there in a convex n-polygon?|
|How many numbers consisting of 3 digits, can you make with the digits 0,1,2,3,4 ?|
|How many subsets are there in a set S of 10 elements?|
|Calculate the term with x2 in the expansion of (x3 + 1/2x)10|
1011011101 is an example op a binary number of length 10.|
How many binary numbers of length 10 end up with 111 and contain exactly two zeros.
In how many ways can you stack m identical bricks into k boxes
so that each box contains at least 1 brick.|
From a deck of cards we take 12 cards.
How many strictly positive integer solutions ( x, y , z) are there,|
such that x + y + z = 100
|How many terms are contained in (a + b + c)20 .|
The term A.a10 b3 c7 is present in the development of (a + b + c)20