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21, 25, 18, 29, 33, 18, ... choose which pair of numbers comes next?
Answer & Solution
Correct Answer:
Option
D
This is a simple addition series with a random number, 18, interpolated as every third number. In the series, 4 is added to each number except 18, to arrive at the next number.
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Login25+4=29
29+4=33
33+4=37
random number, 18 (C) 37,18