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Q.

How many prime numbers are there from  1 to 10?

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a

1

b

2

c

3

d

4 

answer is D.

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Detailed Solution

Numbers from 1 to 101, 2, 3, 4, 5, 6, 7, 8, 9, 10.
We will see the number of factors of each number to find the Prime Number.
1 is not a prime number because it has only 1 factor.
2 is a prime number because it has two factors 1, 2.
3 is a prime number. It has two factors 1, 3
4 is not a prime number. It has more than 2 factors.
5 is a prime number. It has two factors 1, 5
6 is not a prime number. It has more than 2 factors.
7 is a prime number. It has two factors 1, 7
8 is not a prime number. It has more than 2 factors.
9 is not a prime number. It has more than 2 factors.
10 is not a prime number. It has more than 2 factors.
We know that number has two factors, 1 and itself is a prime number.
So, there are 4 prime numbers from 1 to 10.
   
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How many prime numbers are there from  1 to 10?