1.

Cards marked with numbers 5, 6, 7, ......30 are placed in a box and mixed thoroughly and one card isdrawn at random from the box. What is the probability that the number on the card is:i) A prime number.ii) A multiple of 3 or 5. iii) Neither divisible by 5 nor by 10.

Answer»

Total cards 261st

Multiple of three r 15 and 30Probability =2/261/13

2nd

divisible by 5 10 r =5, 10,15,20,25,30So total is 6Not divisible by 5 and 10 r 20Probability =20/2610/13



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