Tell me what to put in each group.

all groups must have a sum as close as possible to the other ones

{-6 , 7 , 1}  {9 , -3 , -4}  {5 , -8 , 4}   ---  2, 2, 1

Step-by-step explanation:

Number 1: {-6 , 7 , 1}  {9 , -3 , -4}  {5 , -8 , 4}   ---  2, 2, 1

Number 2: {-6 , -3 , 9}  {4 , 7 , -8}  {5 , 1 , -4}   ---  0, 3, 2

Number 2: {-4 , 5 , 1}  {7 , 4 , -8}  {-6 , -3 , 9}   ---  2, 3, 0

blue marble is 15 times out of 50 = 15/50 reduces to 3/10

landing on tails is 24 out of 50 = 24/50 reduces to 12/25

to find the probability of both multiply together:

3/10 x 12/25 = 3 x 12 / 10 x 25 = 36/250

if you multiplied the numerator and denominator by 10 you get 360/2500.

the answer is 360/2500