Question

How many natural numbers are there from 2 to 10? what fraction of them are prime number s?​

Answer 1

• There are 9 natural numbers from 2 to 10

• The fraction of prime numbers from 2 to 10 is 4/9

Given :

The number 2 and 10

To find :

• The number of natural numbers from 2 to 10

• The fraction of prime numbers from 2 to 10

Solution :

Step 1 of 2 :

Find number of natural numbers from 2 to 10.

The natural numbers from 2 to 10 are 2, 3, 4, 5, 6, 7, 8, 9, 10.

Hence number of natural numbers from 2 to 10 = 9

Step 2 of 2 :

Calculate fraction of prime numbers from 2 to 10

The natural numbers from 2 to 10 are 2, 3, 4, 5, 6, 7, 8, 9, 10.

Among these 10 numbers prime numbers are 2, 3, 5, 7

∴ Number of prime numbers from 2 to 10 = 4

Hence the required fraction of prime numbers from 2 to 10

$\displaystyle \sf{ = \frac{4}{9} }$

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