Find the missing number in the series. 21, 441, 25, ?
Question and options
Find the missing number in the series.
21, 441, 25, ?
- 50
- 225
- 625
- 125
Answer and explanation
Correct answer: C - 625
The series pairs a number with its square: 21 is followed by 21 squared, which is 441. In the same way 25 is followed by 25 squared, which is 625. The option 125 is 25 cubed and 50 is only 25 doubled, so neither fits the pattern.
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CUSAT Three-Year LL.B.
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