Answer
50
Work Step by Step
2,5,10,17, 26,37
since 5 =2+3
10 = 5 +3+2
17 = 10 +(5+2) = 10+7
26 = 17 + (7 + 2) = 17 + 9
so next number is 37 + (11+2) =50
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