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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**

**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:**

**Option A is correct.****Option B is incorrect.****C is incorrect.****D is not the correct answer.**

**QUICK TIPS…**

**You may please note the****se/this****:**

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

**Use the questions and answers session to deal further on this topic…**

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**/ culled from 2018 JAMB-UTME mathematics question 20 /**