Solution:The pattern followed here is :
{(4 × 1st number) + 2} = 2nd number
(6 : 26) → {(4 × 6) + 2} ⇒ (24 + 2) = 26
(8 : 34) → {(4 × 8) + 2} ⇒ (32 + 2) = 34
(7 : 30) → {(4 × 7) + 2} ⇒ (28 + 2) = 30
But,
(5 : 24) → {(4 × 5) + 2} ⇒ (20 + 2) = 22 ≠ 24
Hence, (5 : 24) is the correct answer.