Engineering
Mathematics
Conditional Probability
Question

The probability of obtaining an even prime number on each die, when a pair of dice is rolled is

0

13

112

136

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Solution
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Even Prime no is (2, 2)

P(even prime no) = 136
Hint : Recall the Formula to obtain Probability For dice related questions.
Step 1 : Obtain sample space For each dice When Dice is rolled –

⇒ 5 = {1, 2, 3, 4, 5, 6}

∴n(S) = 6

Step 2 : Calculate Probability of getting Even Prime No. on Dice

 There is only one Even Prime number ide 2
 Probability of getting 2 on each dice 16

 As, two dices are independent, so Probability of getting 2 on both Dice 16 × 16 = 136

Therefore, Probability of getting Even Prime Number is 136

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