Answer:
-28
Step-by-step explanation:
-4(7)=-28
The three whites:
(30 choose 1) * (29 choose 1) * (28 choose 1) = 30 * 29 * 28
The two reds:
(20 choose 1) * (19 choose 1) = 20 * 19
So, The three whites + two reds = 30 * 29 * 28 + 20 * 19 = 24740
Answer:
9
Step-by-step explanation:
x+x+1+x+2 = 15+x+2
3x+3=x+17
3x=x+14
2x=14
x=7
7+8+9=24
9+15 = 24