Constable (Sindh Police) Mathematics MCQs Police Department Sindh Police Department Complete the given series: 3,7,13,?,31,…….. March 5, 2022 Admin No Comments A: 19 B: 21 C: 23 D: 25 Correct Answer: b Short Details: 3+4=7 7+6=13 13+8=21 21+10=31 View More Details >>