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Posted by on Wednesday, December 26, 2012 at 8:26pm.

A lock on a bank vault consists of 3 dials, each with 30 positions. In order for the vault to open, each of the three dials must be in the correct position. How many different dial combinations are there for this lock?

  • Statistics - , Wednesday, December 26, 2012 at 9:23pm

    Use the multiplication rule if the dial settings are independent of each other.

    For example, if we have 4 independent dials each with 5 numbers, then we have 5 choices for each, and multiplication rule gives 5*5*5*5=625 combinations.

  • Statistics - , Wednesday, December 26, 2012 at 10:50pm

    30*30*30=

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