Study the given pattern carefully and select the number that can replace the question mark (?) in it. 4 10 9 5 13 13 7 19 ?

Explanation

The logic followed here is: Column-wise Logic: 2 (2nd Number - 1st Number) = 3rd Number - 2nd Number Column 1: 2 x (5 - 4) = 7 - 5 ⇒2×1=2 Column 2: 2 x (13 - 10) = 19 - 13 ⇒ 2×3=6 Similarly, Column 3: 2 x (13 - 9) = ? - 13 ⇒ 2 × 4 = ? - 13 ⇒ 8 = ? - 13 ⇒ 8 + 13 = ? ⇒ 21 = ? Hence, ' 21 ' is the correct answer.