Insert the missing number: 10, 5, 13, 10, 16, 20, 19, ______ — WBCS Main Examination 2023 Q199

Q199

ArithmeticNumber Series & Progressions

Insert the missing number: 10, 5, 13, 10, 16, 20, 19, ______

a.22
b.40
c.38
d.23

Answer: (B) 40

Two series alternate: 10, 13, 16, 19 (adding 3) and 5, 10, 20, ? (doubling). The missing term belongs to the second series, so it is 20 × 2 = 40. 22 would be the next term of the first series.

WBCS Main Examination 2023 — Paper VI: Arithmetic and Test of Reasoning · Question 199 of 200