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The formula for the terms of this sequence is, 1.5n2 - 2.5n + 1

The 5th term = (1.5 x 25) - (2.5 x 5) + 1 = 37.5 - 12.5 + 1 = 26

The 6th term is thus, (1.5 x 36) - (2.5 x 6) + 1 = 54 - 15 + 1 = 40

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