- One head three tails any order?

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What is the Balance: No2+H2O=HNO3? #5, how do you set up and solve? Show all of the steps please? Why are rainbows called rainbows? I want to find the value of k by this equation: Ct = C0. k. e^(-kt).
The values of Ct, C0 and t are known.
How should I solve this? F 5 coins are tossed, what is the probability that at most 4 will be a tails?