Question : Direction: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
121, 222, 424, ?
Option 1: 646
Option 2: 828
Option 3: 626
Option 4: 524
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Correct Answer: 828
Solution :
Given:
121, 222, 424, ?
Here, the first and the last digits are being multiplied by 2 and the second digit remains as it is.
121 → 1 × 2 = 2; 2; 1× 2 = 2 → 222
222 → 2 × 2 = 4; 2; 2× 2 = 4 → 424
424 →
4 × 2 = 8; 2; 4× 2 = 8 → 828
Therefore, the series becomes → 121, 222, 424, 828
Hence, the second option is correct.
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