Find the next number in the series: 4, 9, 20, 43, ?
A100
B90
C92
D82
Answer & Solution
Correct answer: B. 90
1. 4 x 2 + 1 = 9; 9 x 2 + 2 = 20.
2. 20 x 2 + 3 = 43.
3. 43 x 2 + 4 = 90.
_Source: RRB Group D CEN-02/2018 PYQ, Q.61._
Related questions
Find the next term of the series: T, A, S, B, R, C, ?Find the next term of the series: 33, 38, 48, 53, ?Find the next term of the series: 3B, 9F, 27J, ?What comes next in the series: 6C, 10F, 14I, 18L, ?In a string, the 6th element to the left of the 15th element from the left is the same as In a school cricket league, A beat B, B beat C, and C beat D. Which is true?A 3 × 3 × 3 cube is painted on all sides and then cut into 27 unit cubes. How many small cA walker goes 3 km North, then 4 km East. His distance from the start is: