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b. 2C6.1C4 / 3C10 = 6!/2!4! . 4!/3! / 10!/7!3! = 15.4 / 120 = 60/120 = 1/2
C. 3C6 / 3C10 = 6!/3!3! / 10!/7!3!= 20 / 120 = 1/6
d. 1C6.2C4 / 3C10 = 6!/5! . 4!/2!2! / 10!/7!3! = 6.3 / 120 = 18/120 = 3/20