Which probabilities do you need in order to calculate P(getting A on 2 or fewer spins)?

“2 or fewer” includes getting 0, 1, or 2 successes. Add the probabilities of those three outcomes: P(0 successes) + P(1 success) + P(2 successes). Probabilities for 3, 4, or 5 successes are not part of the event.

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