The given series is in the pattern (22 - 1), (42 - 1),............ (82 - 1), (102 - 1), (122 - 1). So, the missing term is (62 - 1) = 35

3, 15,?, 63, 99, 143

Correct Answer: 35

Explanation:

The given series is in the pattern (2² - 1), (4² - 1),............ (8² - 1), (10² - 1), (12² - 1). So, the missing term is (6² - 1) = 35

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