Choose the option which contains set of prime numbers.

1, 2, 3, 5, 7

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2, 5, 9, 11, 17

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19, 13, 11, 7, 3

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23, 29, 39, 37, 43

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Solution

The correct option is C
19, 13, 11, 7, 3

Prime numbers have only two factors, 1 and the number itself.

1 is neither prime nor composite.

2 is the only even prime number.

9 and 39 have more than 2 factors, hence they are not prime numbers.

Considering all these, the correct option is 19, 13, 11, 7 and 3.

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Similar questions

1 + 3 + 5 + 7 + 9

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

1 + 3 + 5 + 7 + 9

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

Without adding find the sum

(i) 1 + 3 + 5 + 7 + 9

(ii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19

(iii) 1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 + 23

{2, 3, 5, 7, 11, 13, 17, 19, 23, . . .}

1^{3} = 1

2^{3} = 3 + 5

3^{3} = 7 + 9 + 11

4^{3} = 13 + 15 + 17 + 19

n^{3}

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