A person has 4 coins each of different denomination. What is the number of different sums of money the person can form (using one or more coins at a time)?

What is the sum of all four digit numbers formed by using all digits 0, 1, 4, 5 without repetition of digits ?

Ten different letters of alphabets are given. Words with five letters are formed from these given letters. Then, the number of words which have at least one repeated letter is :

In an examination, a question paper has 12 questions divided into Part I and Part II containing 5 and 7 questions. A student must attempt 8 questions, selecting at least 3 from each part. Number of w…

A triangle PQR is such that 3 points lie on the side PQ, 4 points on QR and 5 points on RP respectively. Triangles are constructed using these points as vertices. What is the number of triangles so f…

The number of ways in which 12 identical pens can be distributed between two students, if each student is to get at least two pens, is