If 4 dice are rolled , then the number of ways of getting sum atleast 13 is
Answer (1)
Student Expert
25th Apr, 2019
Hello Harsh,
4 dices are thrown
then the outcome of the sums can be:
4,5,6,………………14……………..,22,23,24
Mid-point is 14. The left side of the midpoint is a mirror image of the right part.
So let's say the number of ways of getting a 20 is the same as the number of ways of getting an 8
In this case, the number of ways to get the sums are:
4: C(3,0) = 1 (start 1 before the # of throws)
5: C(4,1) = 4
6: C(5,2) = 10
7: C(6,3) = 20
8: C(7,4) = 35
so in this way you can find the sum of at least 13. Finally, the answer will be 861.
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