Each number is got by adding an amount two larger than the last amount added. 9 (+3) 12 (+5) 17 (+7) 24.
Continuing this we get 33, 44 and 57.
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6
Three or more terms of a sequence are needed in order to find its nth term.
34-55-89 are.
80
40.5, 60.75 and 91.125