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Complete the series: 1,3,8,19,42, .................

Complete the series: 1,3,8,19,42, .................

Explanation
1+2 = 3
3x2 = 6+2 =8
8x2 = 16+3 =19
19x2 = 38+4 = 42
42x2 = 84+5 = 89