Complete the series : 2, 5, 9, 19, 37, .....
2020
Complete the series :
2, 5, 9, 19, 37, .....
- A.
75
- B.
76
- C.
77
- D.
78
Attempted by 14 students.
Show answer & explanation
Correct answer: A
The series alternates the operations x2 + 1 and x2 - 1: 2 x 2 + 1 = 5, 5 x 2 - 1 = 9, 9 x 2 + 1 = 19, 19 x 2 - 1 = 37. Next is 37 x 2 + 1 = 75.