# Permutations and combinations - Quantitative Aptitude (MCQ) questions for Q. 29278

**Q. A locker in bank has 3 digit lock. Mahesh forgot his password and was trying all possible combinations. He took 6 seconds for each try. The problem was that each digit can be from 0 to 9. How much time will be needed to by Mahesh to try all the combinations?***- Published on 11 Apr 17***a.** 90 minutes

**b.** 120 minutes

**c.** 60 minutes

**d.** 100 minutes

**ANSWER: 100 minutes**