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Correct
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From the formula of Permutation ,
Answer : (c)
Exercise 5 A Q.1 to Q.23 Cumulative number 1 to 23
Exercise 5 B Q.1 to Q.21 Cumulative number 24 to 44
Exercise 5 C Q.1 to Q.22 Cumulative number 45 to 66
Exercise 5 D Q.1 to Q.20 Cumulative number 67 to 86