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Over a month a factory...

Over a month a factory makes n bottles. The probability that a bottle is defective is 0.02. Write down an expression for the probability that, in any one month, exactly 5 bottles are defective.#1

(n5)(0.02)n−5(0.98)n#2

(n5)(5)0.02(n−5)0.98#3

(n5)(0.02)5(0.98)n−5#4

(n5)(0.02)n−5(0.98)5

(n5)(0.02)n−5(0.98)n#2

(n5)(5)0.02(n−5)0.98#3

(n5)(0.02)5(0.98)n−5#4

(n5)(0.02)n−5(0.98)5

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