There are four different colored balls in a bag, all of which are of the same color. All balls except exactly 12 are blue. All balls except exactly 21 are yellow, all balls except exactly 20 are red, all balls except exactly 19 are green. So how many balls are there in the bag?
- AOption (a)
72
- BOption (b)
24
- COption (c)
48
- DOption (d)
36
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Correct answer
72
