Find the missing term in the series: 2, 1, 4, 3, 6, 5, 8, ?
A10
B9
C8
D7 ✓ Correct
Correct answer: (D) 7
Explanation
The missing term is 7.
Numbers form pairs (2, 1), (4, 3), (6, 5), (8, ?).
In each pair the second number = first - 1.
2 - 1 = 1, 4 - 1 = 3, 6 - 1 = 5.
So 8 - 1 = 7 completes the last pair.
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