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A number is selected at random between 20 and…

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PERCENTAGE PART-2 TYPE-1,2,3 || By PRINCE SHARMA

PERCENTAGE PART-2 TYPE-1,2,3 || By ...
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A number is selected at random between 20 and 30 both numbers inclusive. Find the probability that the number is a prime

A. 2 / 11

B. 5 / 11

C. 6 / 11

D. 8 / 11

QUICK ANSWER…

A

SOLUTION 

If both numbers are inclusive, then the numbers between 20 and 30 are:

20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30

The total number = 11

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Prime numbers among these are:

23, and 29 = 2 numbers

Now, probability = required outcome/possible outcome

Hence, the probability that the number is prime = 2/11

Now for the right answer to the above question:

  1. Option A is correct.
  2. Option B is incorrect.
  3. C is incorrect.
  4. D is not the correct answer.

QUICK TIPS…

You may please note these/this:

  • Prime numbers are numbers that can only be divided by one and itself.

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/ culled from 2018 JAMB-UTME mathematics question 20 /

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