Complete the series66, 63, 57, 45, ......?
- 25
- 24
- 21
- None of these
Explanation
66, 63, 57, 45, ?
Now check the differences between terms:
- 66 → 63 (−3)
- 63 → 57 (−6)
- 57 → 45 (−12)
Pattern: −3, −6, −12, which is multiplying by 2 each time.
So, the next difference: −24
45 − 24 = 21
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- None of these
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- 18
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