Mathematics

12 April, 08:29

The diagram shows a door lock.

A

1

B

2

С

3

The code is a letter followed by a number.

a) How many different codes are there altogether?

b) I know that the correct code begins with C.

I press C, then I guess the single digit number.

What is the probability that I open the door?

Give your answer as a fraction.

+3

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