Reasoning • Number & Letter SeriesHard
What number comes next in the series: 3, 50, 9, 54, 15, 58, 21, ?
A. 62✓ Correct Answer
B. 58
C. 66
D. 27
💡 Solution & Explanation
Two series are mixed together. The 1st, 3rd, 5th and 7th terms (3, 9, 15, 21) go up by 6. The 2nd, 4th and 6th terms (50, 54, 58) go up by 4. The missing term is the 8th, which belongs to the second series: 58 + 4 = 62.