Question

A die is rolled ,what is the probability of getting 7​

Answer 1

For each of the possible outcomes add the numbers on the two dice and count how many times this sum is 7. If you do so you will find that the sum is 7 for 6 of the possible outcomes. Thus the sum is a 7 in 6 of the 36 outcomes and hence the probability of rolling a 7 is 6/36 = 1/6.

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Answer 2

Given:

A die is rolled.

To Find:

The probability of getting 7.

Solution:

To find the probability of getting 7 we will follow the following steps:

As we know,

Die is 6 sided and the numbers are from 1 to 6.

And,

Probability is calculated as

$\frac{no \: of \: favourable \: outcomes}{total \: number \: ofpossible \: outcomes}$

But,

Here die is rolled once and the single die is used so there is no chance of getting 7.

So,

No. of favourable outcomes is 0.

Now,

$probability = \frac{0}{6} = 0$

Henceforth, the probability of getting 7 is 0.