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

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83

and

89

81

and

82

84

and

87

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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