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Q.

How do you list all the prime numbers between 80 and 90?

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a

83 and 89

b

81 and 82

c

84 and 87

d

83 and 87 

answer is A.

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Detailed Solution

We can remove the even numbers in between 80 and 90 because the even numbers are the numbers which are divisible by 2. So, they cannot be the prime numbers.
83 is not divisible by 3 and 7.
∴ It is a prime number.
 89 is not divisible by 3 and 7.
∴ It is also a prime number.
 
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