26
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26 Edit: a₁ = 8 , a₂= 8 + 2 = 10 , a₃& a₄up by 4, a₅ & a₆ up by 8 , .... by 16 a₄= 18 a₅ = 18 + 8 = 26 => answer
Find the missing number in the series (in red) :2 , 4 , 5, 9, 9 , 16 , 14 , ? , 20 , ….
18
14 * 18 = (10 + 4) * 18 (10 * 18) + (4 * 18) 180 + 72 252
18. It is the middle number when they are listed in order.