Question
The missing number in the series: 4, 9, 25, ?,
121, 169, 289Solution
The series is the square of prime numbers: • 4 = 2² • 9 = 3² • 25 = 5² • 49 = 7² • 121 = 11² • 169 = 13² • 289 = 17² Hence, the missing number is 49 (7²).
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