Permutation and Combination, Probability

1. January 07, 2004: In how many ways can the letters of the word "PROBLEM" be rearranged to make seven letter words such that none of the letters repeat? Answer »
   
   
2. January 30, 2004: Ten coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head? Answer »
   
   
3. March 23, 2004: In how many ways can 5 letters be posted in 3 post boxes, if any number of letters can be posted in all of the three post boxes? Answer »
   
   
4. April 20, 2004 : A man can hit a target once in 4 shots. If he fires 4 shots in succession, what is the probability that he will hit his target? Answer »
   
   
5. June 1, 2004 : There are 6 boxes numbered 1, 2, ... 6. Each box is to be filled up either with a red or a green ball in such a way that at least 1 box contains a green ball and the boxes containing green balls are consecutively numbered. The total number of ways in which this can be done is: Answer »
   
   
6. November 26, 2004:What is the probability that the position in which the consonants appear remain unchanged when the letters of the word "Math" are re-arranged? Answer »
   
   
7. December 10, 04: How many different four letter words can be formed (the words need not be meaningful) using the letters of the word MEDITERRANEAN such that the first letter is E and the last letter is R? Answer »

Questionbank of GMAT Sample Questions

Quick Links