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SSC CGL Model Paper 14

Question : 6 of 100

Marks: +1, -0

In the following question, select the odd number from the given alternatives.

Solution:

Concept:

The odd number is found by checking whether each option is prime or composite.

Explanation:

Factorise each option:

145 = 5 \times 29

, so it is composite.

463

has no factor other than

1

and itself, so it is prime.

581 = 7 \times 83

, so it is composite.

651 = 3 \times 217 = 3 \times 7 \times 31

, so it is composite.

Thus, all numbers except

463

are composite.

Answer:

463

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