1.

The Balls In A Bag Are Numbered From 1 To 20 And Mixed Up. If One Ball Is Drawn Out Randomly Then What Is The Probability That The Drawn Ball Has A Number, Which Is A Multiple Of 3 Or 5?

Answer»

Total number of multiple of 3 upto 20 = 20/3= 6 (only taking whole number)

Total number of multiple of 5 upto 20= 20/5 = 4

Total number of 3*5 upto 20= 1

So total multiple upto of 3 or 5 upto 20= 6+4-1= 9

So REQUIRED PROBABILITY = 9/20.

Total number of multiple of 3 upto 20 = 20/3= 6 (only taking whole number)

Total number of multiple of 5 upto 20= 20/5 = 4

Total number of 3*5 upto 20= 1

So total multiple upto of 3 or 5 upto 20= 6+4-1= 9

So required probability = 9/20.



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