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This is called Binomial Probability related to the Binomial Expansion..

So your expression should be:
\[\large (0.61)^3\times (0.39)^3 \times (0.80) \times (0.20)^3\]

yeah, and i dont think your answer is right..

the binomial expansion:
\[(a+b)^n = \binom{n}{r}
*(a)^{n-r} * (b)^{n}\]

nope..

\[\binom{6}{3} *(0.61)^3*(0.39)+\binom{4}{1} *(0.80)^1*(0.20)^3\]
apparently not right

you obviously need to multiply the two probabilities, not add them - think about it.

still not right

close though

the answer is \(0.0060\)

and what do you seem to be getting?

\(0.0453\)
man i hate probability; forget it

I am starting to hate it too -...-

lol its horrible; too confusing -_-