Common Mental Ability
Number Series Practice — Set 2
15 number series questions. Find the next number or missing number.
Number Series Practice — Set 2
15 questions · 12 minutes
12:00
Q1.2, 5, 10, 17, 26, ___
Explanation: Differences: 3,5,7,9 (odd numbers). Next diff = 11. 26+11 = 37.
Q2.1, 1, 2, 3, 5, 8, 13, ___
Explanation: Fibonacci: each = sum of previous two. 8+13 = 21.
Q3.3, 9, 27, 81, ___
Explanation: Each × 3. 81 × 3 = 243.
Q4.100, 96, 91, 85, 78, ___
Explanation: Differences: -4,-5,-6,-7. Next = -8. 78-8 = 70.
Q5.2, 6, 18, 54, ___
Explanation: Each × 3. 54 × 3 = 162.
Q6.1, 4, 9, 16, 25, ___
Explanation: Perfect squares: 1²,2²,3²,4²,5²,6² = 36.
Q7.7, 11, 13, 17, 19, ___
Explanation: Prime numbers starting from 7: 7,11,13,17,19,23.
Q8.5, 11, 23, 47, ___
Explanation: Pattern: ×2+1. 47×2+1 = 95.
Q9.120, 60, 30, 15, ___
Explanation: Each ÷ 2. 15 ÷ 2 = 7.5.
Q10.1, 8, 27, 64, 125, ___
Explanation: Cubes: 1³,2³,3³,4³,5³,6³ = 216.
Q11.4, 7, 12, 19, 28, ___
Explanation: Differences: 3,5,7,9. Next = 11. 28+11 = 39.
Q12.2, 3, 5, 7, 11, 13, ___
Explanation: Prime numbers: 2,3,5,7,11,13,17.
Q13.10, 20, 40, 80, ___
Explanation: Each × 2. 80 × 2 = 160.
Q14.1, 2, 4, 7, 11, 16, ___
Explanation: Differences: 1,2,3,4,5. Next = 6. 16+6 = 22.
Q15.6, 11, 21, 36, 56, ___
Explanation: Differences: 5,10,15,20. Next = 25. 56+25 = 81.
Score: 0 / 15
PSC Score (with -0.33): 0 / 15
0 correct (+1 each) ·
0 wrong (-0.33 each) ·
0 unanswered (0)
0% accuracy ·
Time: 00:00
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