Question


tossing a coin tails up or rolling a number less than 4 on a number cube.

I got 1/2 + 3/6 and got 1.
The answer is 3/4. I don't understand what to do. Please help.

Answers

Steve
clearly the answer cannot be 1, since that would mean you always get tails or roll less than 4.

there are 12 possible outcomes, easy to list them.

1/2 give tails
1/2 * 3/6 = 1/4 gives heads and n<4.

1/2 + 1/4 = 3/4

or, consider P(heads & n>=4) = 1/2 * 1/2 = 1/4

you want 1 minus that, or 3/4.

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