## Number Series - Quantitative Aptitude for IBPS & SBI PO, IBPS & SBI Clerk, LIC, RBI, RRB, IPPB, UPSC, SSC CGL and other exams

Directions: What comes in place of "?"
1. 550, 1300, 2800, 5050, 8050, ?
1. 15400
2. 15800
3. 15600
4. 15200
2. 25987.5, 4725, 1050, 300, 120, ?
1. 100
2. 60
3. 40
4. 80
3. 8192, 2048, 512, 128, 32, ?
1. 12
2. 8
3. 4
4. 2
4. 6, 31, 126, 381, 766, ?
1. 771
2. 773
3. 775
4. 777
5. 2, 20, 62, 136, 250, ?
1. 404
2. 408
3. 412
4. 416
6. 46, 47, 55, ?, 146, 271
1. 62
2. 72
3. 42
4. 82
7. 18, 20, 21, 22, 24, ?
1. 25
2. 26
3. 27
4. 28
8. 15, 16, 20, ?, 45, 70
1. 23
2. 26
3. 29
4. 31
9. 4, 8, 7, 12, ?, 17
1. 10
2. 15
3. 11
4. 12
10. 5, 8, 13, ?, 29, 40
1. 18
2. 20
3. 25
4. 22
11. -2, 0, 11, 58, ?, 1016
1. 200
2. 223
3. 246
4. 249
12. 20, 36, 48, 56, 60, ?
1. 62
2. 60
3. 64
4. 66
13. 513, 345, 219, ?, 59, 21
1. 109
2. 119
3. 129
4. 139
14. 49, 46, 40, 31, 19, ?
1. 6
2. 4
3. 2
4. 0
15. 1, 6, 31, ?, 781, 3906
1. 156
2. 154
3. 152
4. 150

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1. 11800+750*1, +750*2,......, +750*5 →8050+750*5 = 11800
2. 80/5.5, /4.5, /3.5, /2.5, /1.5 → 120/1.5 = 80
If you find it difficult to divide, let's come from the right hand side
Which means *2.5, *3.5, *4.5, *5.5, so we can say ? * 1.5 = 120 = 80
3. 8
/4, /4, /4......→ 32/4 = 8
4. 771
*6+0, *5+1, *4+2, ....., *1+5 → 766*1+5=771
5. 412
This follows two sets
20-2=18, 62-20=42, 136-62=74, 250-136=114 ......(1)
42-18=24, 74-42=32, 114-74=40 ............(2)
24, 32, 40 are multiples of 8, next comes 48, 56, 64....
therefore 114+48=162 then, 162+250= 412
6. 82
+1^3, +2^3, +3^3, +4^3, +5^3
7. 25
in the given series 19 and 23 are missing which are prime numbers, so the next term will be 25 which is not a prime number.
8. 29
+1², +2², +3², +4², +5²
9. 11
+4, -1, +5, -1, +6
10. 20
+3, +5, +7, +9, +11
11. 249
4^0-3, 4^1-4, 4^2-5, 4^3-6, 4^4-7, 4^5-8
12. 60
+4*4, +4*3, +4*2, +4*1, +4*0
13. 129
8^3+1, 7^3+2, 6^3+3, 5^3+4, 4^3+5, 3^3+6
14. 4
-3, -6, -9, -12, -15
15. 156
*5+1, *5+1, *5+1, *5+1, *5+1