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

 IBPS CWE CLERK UPDATES :: ARITHMETIC IMPORTANT QUESTIONS

1.9 19 40 83 ? 345 696
1) 162
2) 170
3) 175
4) 166
5) None of these

2. 980 484 236 112 50 ? 3.5
1) 25
2) 17
3) 21
4) 29
5) None of these

3. 8 9 20 63 256 1285 ?
1) 6430
2) 7450
3) 7716
4) 7746
5) None of these

4. 1015 508 255 129 66.5 ? 20.875
1) 34.50
2) 35
3) 35.30
4) 35.75
5) None of these

5. 12 12 18 36 90 270 ?
1) 945
2) 810
3) 1080
4) 1215
5) None of these

6. 139, 175, 126, 190, 109, ?
1) 219
2) 209
3) 201
4) 212
5) 203

7. 448, 225, 76, ?, 5
1) 45
2) 15
3) 18
4) 20
5) 55

8. 342, ?, 396, 450, 522, 612
1) 360
2) 370
3) 348
4) 380
5) 350

9. 219, 220, 247, 372, ?, 1444
1) 615
2) 715
3) 815
4) 425
5) 625

10. 41, 85, 175, 357, 723, ?
1) 1475
2) 1437
3) 1427
4) 1587
5) 1457

1. 2
The given series is
×2+1, ×2+2, ×2+3, ×2+4, ...

2. 5
The given series is ÷2 -6
Reqd no. = 50 ÷ 2 - 6 = 25 - 6 = 19

3. 3
The given series is
×1+1, ×2+2, ×3+3, ×4+4, ×5+5, ×6+6 is

4. 4
(1015 + 1) ÷ 2 = 508;
(508 + 2) ÷ 2 = 255; (255 + 3) ÷ 2 = 129;
(129 + 4) ÷ 2 = 66.5; (66.5 + 5) ÷ 2 = 35.75;
(35.75 + 6) ÷ 2 = 20.875

5. 1
The given series is
×1, ×1.5, ×2, ×2.5, ...

6. 2
The series is:
+6x6, -7x7 , +8x8 , -9x9 , +10x10
7. 4
The series is:
/2+1, /3+1, /4+1, /5+1

8. 1
The series is:
+18, +36, +54, +72, +90

9. 2
The series is:
+1 CUBE, +3 CUBE, + 5CUBE, +7 CUBE, +9 CUBE

10. 5
The series is:
x2+3, x2+5, x2+7, x2+9 , x2+11

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