Hi
two dice are tossed simultaneously.
probability that the total number of spots on the upper faces of the two dice
is not divisible by 2, 3 or 5.
Sums are 2,3,4,5,6,7,8,9,10,11,12 (7 and 11 the only sums that qualify)
P = (6+2)/36 = 8/36 = 2/9
___1_2_3__4__5__6
1|_2_3_4__5__6__7
2|_3_4_5__6__7__8
3|_4_5_6__7__8__9
4|_5_6_7__8__9_10
5|_6_7_8__9_10_11
6|_7_8_9_10_11_12