Posted by **Matt** on Thursday, February 16, 2012 at 2:59pm.

Given two spinners one with four equal parts labeled 1,1,3,4. And one with six regions labeled 1,2,3,4,5,6. Given one spin on each spinner what is the probability of spinning two numbers with the sum of 7?

- Math -
**MathMate**, Thursday, February 16, 2012 at 3:06pm
Spinner 1 : 4 outcomes

Spinner 2 : 6 outcomes

The spinners are independent of each other, so the multiplication rule applies.

Total possible outcomes: 4*6=24

Count how many compound events (one outcome from each spinner) gives a sum of 7.

For example,

1+6, 1+6, 3+4, 4+3 for a total of 4 events.

So P(7)=4/24=1/6

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