Question
Download Solution PDFFind the missing term of the given series:
724, 715, 690, 641, ? , 439
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFFind differences between terms:
724 → 715 → Difference = -9
715 → 690 → Difference = -25
690 → 641 → Difference = -49
These differences look like square numbers:
9 = 3²
25 = 5²
49 = 7²
→ So the pattern is subtracting consecutive odd squares (3², 5², 7²...)
Next square in the pattern = 9² = 81
So,
641 - 81 = 560
Next square = 11² = 121
560 - 121 = 439
Thus, the missing term is 560.
Last updated on Jun 17, 2025
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