Question
4, 17, 62, 317, ?, 13267
What should come in place of the question mark (?) in the following number series?Solution
4 `xx`  3 + 5 = 17 17 `xx`  4 – 6 = 62 62 `xx`  5 + 7 = 317 317 `xx`  6 – 8 = 1894 1894 `xx`  7 + 9 = 13267
((99.9 - 20.9)² + (99.9 + 20.9)² )/(99.9 x 99.9 + 20.9 x 20.9) = ?
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