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Q.

How many prime numbers are between 1 and 30?


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a

20

b

5

c

10

d

None of the above 

answer is C.

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Detailed Solution

Calculating the prime numbers between 1 and 30.
Let’s find prime numbers between 1-10,
2,3,5,7 are the prime numbers that lie between 1 - 10.
Let’s find prime numbers between 10-20,
11, 13, 17, 19 are the prime numbers that lie between 10-20.
Let’s find prime numbers between 20-30,
23, 29 are the prime numbers that lie between 20-30.
Thus, the prime numbers that lie between 1 – 30 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.
Therefore, there are 10 prime numbers between 1 and 30.
Hence, option 3 is correct.
 
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