Select the number from among the given options that can replace the question mark (?) in the following series.
503, 509, 521, 539,?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 563.
Given series: 503, 509, 521, 539,?
503 + 6 = 509, 509 + 12 = 521, 521 + 18 = 539, 539 + 24 = 563