Answer:
x
2
+
2
x
−
15
Step-by-step explanation:
4 + 3m and 2x + 3y. Sum means addition
A little more info please?
We take 2 marbles from 20 marbles and the total ways is 20x19:2=190
But we need only 2 red marbles and the ways is 14x13:2=91
And finally we do the division 91:190=91/190 is the probability we need