In following number series, two terms have been put within brackets. Choose the appropriate option - Which number replace question mark in the series 7, 12, 19, ?, 39.
Answer: B. 28
Clearly, the given sequence follows the pattern: +5, +7, +9 ... i.e., 7 + 5 = 12, 12 + 7 = 19, ... . .'. Missing Number = 19 + 9 = 28. Hence, the answer is (b).