Look at this series: 21, 9, 21, 11, 21, 13, 21, ... What number should come next?

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Solution

The correct option is D 15
In this alternating repetition series, the random number 21 is interpolated every other number into an otherwise simple addition series that increases by 2, beginning with the number 9.

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15 t h

2 \frac{1}{2} + 1 \frac{7}{13} + 1 \frac{1}{9} + \frac{20}{23} + . . . . .

15^{t h}

2 \frac{1}{2} + 1 \frac{7}{13} + 1 \frac{1}{9} + \frac{20}{23} +

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