Question
3, 4, 10, 33, 136,
?Solution
3 x 1 + 1 = 4 4 x 2 + 2 = 10 10 x 3 + 3 = 33 33 x 4 + 4 = 136 136 x 5 + 5 = 685
The third proportional to (4x² – 4y²) and (2x–2y) is:
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