What number should replace the question mark?
5, 12, 7, 15, 8, 18, 10, ?

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Solution

The correct option is B 21
It consists of two alternate series. 5, 7, 8, 10 and 12, 15, 18
Next term in the second series is 21.

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Similar questions

11, 13, 8, 10, 15, 18, 12, 7, 9, 16

m n s q^{2}

\frac{2}{7} = \frac{8}{□}

\frac{5}{8} = \frac{10}{□}

\frac{3}{5} = \frac{□}{20}

\frac{45}{60} = \frac{15}{□}

\frac{18}{24} = \frac{□}{4}

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