The night before the exam, sleep. A rested mind recalls what a tired one has only read.

SOF NSO · Free quiz

SOF NSO — free 10-question quiz

No signup needed. Answer 10 questions in the SOF NSO pattern, get instant scoring and solutions, then unlock full mocks and your weak-topic map for free.

Question 1 of 10

Medium

Find the missing number in the series: 2, 5, 10, 17, 26, ?, 50