Yes! 2+2=4, and 2*2=4.
Both are equivalent but have different mathematical operations.
X 1 2 3 4
p(x) 0.40 0.20 0.15 ?
If the items are only 4. The total of the probability must be 1 or 100%
1 - 0.40 - 0.20 - 0.15 = 0.25
The probability of 4 is 0.25.
63: 1 x 63 3 x 21 7 x 9................
