Steve Foley writes:

BZZZZZZZZZZZZTTT Wrong again stupid.

Try running your coin toss through this formula.

I did.

Chance of heads on one toss = 0.50

Chance of heads at least once on two tosses = 1-((1-0.50)*(1-0.50)) =
0.75

Chance of engine failure on single = 0.001

Chance of at least one engine failure with two engines =
1-((1-0.001)*(1-0.001)) = 0.001999

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