Question

Two dice are rolled .Find the probability that the sum of the numbers obtained is 8or9

Answer 1

Step-by-step explanation:

s=(1,1),(1,2),(1,3)(1,4).............

............

(6,6)

a=(2,6),(3,5),(3,6),(4,4),(4,5),(5,3),(5,4),(6,2),(6,3)

Answer 2

For getting an eight: For any outcome of the first die there are 6 possible outcomes for the second. Therefore there are 6 x 6 = 36 possible outcomes.

Of all those outcomes, the ones for which a + b = 8 are:

2+6, 3+5, 4+4, 5+3, 6+2 or 5 outcomes.

Probability is the ratio of the number of expected outcomes to the number of all possible outcomes, so in this case

P = 5/36 ≈ 0,1389 or 13,89 %.

for 9:

use the similar process

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