Question 40

Choose the option which has the same relationship with the number as displayed by the first pair.

648 : 20: :16:?

Solution

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648

Sum of digits is 18. Product of digits is 192. These two is not describing the relation. Let's try number of factors.

648 = $$2^3*3^4$$

Number of factors = 4*5 = 20

This is correct.

Number of factors for 16 = 5.

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