Select the number from among the given options that can replace the question mark (?) in the following series.
20, 120, 240, 380,?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3, i.e., 540.
20 + (1 × 10) = 120, 120 + (2 × 10) = 240, 240 + (3 × 10) = 380, 380 + (4 × 10) = 540.