What is the percentage of the number of prime numbers in the first 20 natural numbers?

30 %

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40 %

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50 %

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60 %

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Solution

The correct option is B $40 %$
There are 8 prime numbers in first 20 natural numbers.
2,3,5,7,11,13,17 and 19.

So, percentage of prime numbers in first 20 natural numbers will be
$\frac{8}{20} \times 100 = 40 %$

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Similar questions

Find the mean of:
(i) First eight natural numbers

(ii) First ten odd numbers

(iii) First five prime numbers

(iv) First six even numbers

(v) First seven multiples of 5.

(vi) Factors of 20

(vii) All prime numbers between 50 and 80

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