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Number series (missing term): Successive subtractions of perfect squares. Given sequence: 198, 194, 185, 169, ? Hint: subtract 2², 3³? No—subtract squares in order: 4, 9, 16, 25, … Choose the correct missing number.

Q: Number series (missing term): Successive subtractions of perfect squares. Given sequence: 198, 194, 185, 169, ? Hint: subtract 2², 3³? No—subtract squares in order: 4, 9, 16, 25, … Choose the correct missing number.

Pattern 198 − 4 = 194 (−2²), 194 − 9 = 185 (−3²), 185 − 16 = 169 (−4²). Next subtract 5² = 25. Compute 169 − 25 = 144 Final Answer 144

Difficulty: Easy

Correct Answer: 144

Explanation:

Pattern
198 − 4 = 194 (−2²), 194 − 9 = 185 (−3²), 185 − 16 = 169 (−4²). Next subtract 5² = 25.

Compute
169 − 25 = 144

Final Answer
144

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