12, 23, 35, 47, 59, 73
ATQ, 5 × 2 + 2 = 12 5 × 4 + 3 = 23 5 × 6 + 5 = 35 5 × 8 + 7 = 47 5 × 10 + 11 = 61 5 × 12 + 13 = 73 So, 61 should come in place of 59.
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