Directions: Find the missing term in the following series. 2, 7, 25, ?, 531, 3193

The series follows a pattern of multiplying the previous term by an increasing integer and then adding or subtracting an alternating value. Let us test the successive multipliers and additions: 2 * 3 + 1 = 7, 7 * 4 - 3 = 25, 25 * 5 - 20 = 105 (wait, the pattern is different). Let's use multiplication by 4 plus an increasing odd number: 2 * 3 + 1 = 7, 7 * 4 - 3 = 25, 25 * 5 - 20 = 105 is not a clean pattern. The correct working is 2 * 2 + 3 = 7, 7 * 3 + 4 = 25, 25 * 4 + 5 = 105. To verify, 105 * 5 + 6 = 531 and 531 * 6 + 7 = 3193. Therefore, the missing term is 105.

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