Quant Quiz for IBPS Clerk

Directions (1-5): What should come in place of question mark (?) in the following number series?

1. 1200 480 192 76.8     30.72   12.288   ?
(1) 4.9152
(2) 5.8192
(3) 6.7112
(4) 7.6132
(5) 8.5172


2. 963 927 855 747 603 423 ?
(1) 209
(2) 208
(3) 207
(4) 206
(5) 205

3. 841 961 1089 1225 1369 1521 ?
(1) 1581
(2) 1681
(3) 1781
(4) 1881
(5) 1981

4. 18  20 44 138 560 2810 ?
(1) 16818
(2) 16836
(3) 16890
(4) 16872
(5) 16890

5. 6    26 134 666 3334 16666 ?
(1) 84334
(2) 83334
(3) 83434
(4) 83443
(5) None of these

Answers
1. (1)
1200 ÷ 2.5 = 480
480 ÷ 2.5 = 192
192 ÷ 2.5 = 76.8
76.8 ÷ 2.5 = 30.72
30.72 ÷ 2.5 = 12.288
∴ ? = 12.288 ÷ 2.5 = 4.9152

2. (3)
963 – 1  x 36 = 963 – 36 = 927
927 - 2  x 36 = 927 – 72 = 855
855 – 3  x  36 = 855 – 108 = 747
747 – 4  x  36 = 747 – 144 = 603
603 – 5  x  36 = 603 – 180 = 423
∴ ? = 423 – 6  x  36 = 423 – 216
= 207

3. (2)
29 x  29 = 841
31 x 31 = 961
33 x 33 = 1089
35 x 35 = 1225
37 x 37 = 1369
39 x 39 = 1521
∴ ? = 41 x 41 = 1681

4. (4)
18 x 1 + 2 = 18 + 2 = 20
20 x 2 + 4 = 40 + 4 = 44
44 x 3 + 6 = 132 + 6 = 138
138 x 4 + 8 = 552 + 8 = 560
560 x 5 + 10 = 2800 + 10 = 2810
∴ ? = 2810 x 6 + 12 = 16860 + 12
= 16872

5. (2) : 6 x 5 – 4 = 26
26 x 5 + 4 = 134
134 x 5 – 4 = 666
666 x 5 + 4 = 3334
3334 x 5 – 4 = 16666
16666 x 5 + 4 = 83334