Aptitude - Probability - Discussion
Discussion Forum : Probability - General Questions (Q.No. 4)
4.
What is the probability of getting a sum 9 from two throws of a dice?
Answer: Option
Explanation:
In two throws of a dice, n(S) = (6 x 6) = 36.
Let E = event of getting a sum ={(3, 6), (4, 5), (5, 4), (6, 3)}.
 P(E) = |
n(E) | = | 4 | = | 1 | . |
| n(S) | 36 | 9 |
Discussion:
52 comments Page 5 of 6.
Prince said:
8 years ago
Why we take these cases only?
(3+6) = 9.
(4+5) = 9.
(5+4) = 9.
(6+3) = 9.
(3+6) = 9.
(4+5) = 9.
(5+4) = 9.
(6+3) = 9.
Pooja gm said:
7 years ago
Why we take this case only?
(3+6)
(4+5)
(5+4)
(6+3).
This also possible;
(7+2),
(1+8),
(2+7),
(8+1),
Please explain the reason.
(3+6)
(4+5)
(5+4)
(6+3).
This also possible;
(7+2),
(1+8),
(2+7),
(8+1),
Please explain the reason.
(1)
Swathi said:
7 years ago
Why we should not use the permutations here?like sum 9 can appear in either (6, 3) or (3, 6) , (5, 4) or (4, 5). Why we only choose the one possibility?
(1)
Joshua said:
7 years ago
Because in a throw of two dices there is only 6x6, is the last the number won't Or should not exceed 6.
(1)
Arif said:
7 years ago
At first you draw sample space then you find pair which sum is 9, (1,1), (1,2),....... (5,4), (6,3),(3,6), (4,5).
Total pair 36 and sum of 9 pair is 4 them p(sum 9)= 4 ÷ 36 = 1/9.
Total pair 36 and sum of 9 pair is 4 them p(sum 9)= 4 ÷ 36 = 1/9.
(4)
RRK said:
7 years ago
Is throwing a dice two times and throwing two dice together, same?
Please, anyone, clear me.
Please, anyone, clear me.
(1)
Surya said:
6 years ago
One dice have six faces so here we have two dices, so the formula is n2 (n Square). So 6*6 =36.
(1)
Nikolay said:
6 years ago
@Pooja Gm.
Dice does not have 8 surfaces it has only 6.
Dice does not have 8 surfaces it has only 6.
(3)
Ankita said:
6 years ago
Why not taking the case {3,3}? Please explain me.
(3)
Qaisar wagay said:
4 years ago
Here how could you consider (5, 4) and (4, 5) two different events? Please explain.
(4)
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