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Questions:1. Look at this series: 22, 19, 21, 18, 20, 17, 19 ... What three numbers shoud come next? A. 19, 18, 17 B. 18, 16, 17 C. 16, 18, 15 D. 16, 19, 15 2. Here's a more complex series: 10, 12, 50, 15, 17, 50, 20 ... What two numbers should come next? A. 50, 21 B. 21, 50 C. 50, 22 D. 22, 50 Answers:1. The correct answer is C.
The pattern for this series goes subtract 3, add 2, subtract 3, add 2 and so on. The last two numbers were 17 and 19 and their difference is 2. So subtract 3, gives you 16, and then adding 2 gives you 18. And finally, subtracting 3 gives you 15, so the pattern is 16, 18, 15. 2. The correct answer is D. Chances are, this series is too complex to besolved simply by reading the string of numbers. So you will want to begin by looking for repetition. By dong this, you will see that the random number 50 has been introduced (10, 12, 50, 15, 17, 50, 20). To figure out the rest of the series, simply read the numbers leaving the random number out. Doing so will show you that the series otherwise increases first by 2 (10 + 2 = 12), then by 3 (12 + 3 = 15), then by 2 (15 + 2 = 17), then by 3 again (17 + 3 = 20). Continuing the pattern would lead you to: 20 + 2 = 22. Then reinsert the random number 50, which will bring you to: 22, 50. So the correct answer is D.
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