SOLUTIONS:
S11. Ans.(a)
Sol. Wrong number = 5
Patterns of series
3036 ÷ 6 – 1 = 505
505 ÷ 5 – 1 = 100
100 ÷ 4 – 1 = 24
24 ÷ 3 – 1 = 7
7 ÷ 2 – 1 = 2.5
2.5 ÷ 1 – 1 = 1.5
So, there should be 2.5 in place of 5.
S12. Ans.(d)
Sol. Wrong numbers = 125
Pattern of series
120120 ÷ 13 = 9240
9240 ÷ 11 = 840
840 ÷ 7 = 120
120 ÷ 5 = 24
24 ÷ 3 = 8
8 ÷ 2 = 4
So, there should be 120 in place of 125.
S13. Ans.(b)
Sol. Wrong Number = 812
Pattern of Series
1050 – 12×2 = 1026
1026 – 12×3 =990
990 – 12×4 = 942
942 – 12×5 = 882
882 – 12×6 = 810
810 – 12×7 = 726
So, there should be 810 in place of 812.