Number Series and Sequence
- 2/5 : 4/7 : 6/9 : 8/11 : _____
1) 11/14
2) 10/13
3) 12/15
4) 10/15
5) 11/13
Ans: 2) numerator: n+2, denominator: n+2
- 1½ : 2 2/3 : 3¾ : 4 4/5
1) 5 5/6
2) 5 4/5
3) 6 6/7
4) 4 5/7
5) 6 5/7
Ans: 1) all numbers, n+1
- 2, 5, 4, 10, 6, 15, 8, __, __,
1) 20, 10
2) 10, 20
3) 10, 10
4) 20, 20
5) 8, 10
Ans: 1) even number: n+2
- 10, 5, 20, 10, 60, 30, 240, 120, 1200, __, __,
1) 600, 400
2) 120, 600
3) 600, 7200
4) 1200, 7200
5) 120, 580
Ans: 3) (10 x 2; n x 3, n x 4…….)
(15 + 2), (17 + 2), (19 + 2)….
- 10, 15, 9, 17, 8, 19, 7, __, __,
1) 21, 7
2) 21, 6
3) 20, 6
4) 20, 7
5) 21, 23
Ans: 2) (10 – 1), (9 – 1), (19 + 2)
- 25, 23, 36, 34, 49, 47, 64, __, __,
1) 62, 79
2) 60, 80
3) 62, 82
4) 60, 81
5) 62, 81
Ans: 5) 5
- 721, 521, 711, 531,701, 541, __, __,
1) 691, 550
2) 690, 551
3) 692, 551
4) 691, 551
5) 691, 552
Ans: 4) 721 – 10, n-10
521 + 10, n+10
- 148/450, 158/440, 168/430, 178/420, ___, ___,
1) 188/410, 198/400
2) 188/400, 188/410
3) 188/400, 198/400
4) 188/420, 188/430
5) 188/400, 198/410
Ans: 1) numerator: 148 + 10, n+10, denominator: 450 – 10, n-10
- 1.15, 2.25, 3.35, 4.45, _____,
1) 5.15
2) 5.45
3) 5.50
4) 4.50
5) 5.55
Ans: 5) 1.15; (n + 1.10)
- 75, 125, 100, 175, 125, 225, ___, ___,
1) 150, 275
2) 150, 250
3) 175, 275
4) 175, 250
5) 175, 265
Ans: 1st -3rd -5thnos….(n + 25): 2nd -4th-6th nos…..(n + 50)
- 14, 15, 19, 20, 25 ,26, 32, 33, ___, ___,
1) 39, 42
2) 39, 40
3) 40, 41
4) 38, 41
5) 38, 40
Ans: 3) 1st -3rd -5th nos…..(n + 5.(n + 6), (n + 7) …..
2nd -4th -6thnos…..(n + 5), (n + 6), (n + 7) …..
- 48, 48, 53, 43, 59, 37, ___, ___,
1) 65, 30
2) 65, 31
3) 66, 36
4) 66, 31
5) 66, 30
Ans: 5) 48 + 5 (n + 6, n + 7 ……)
48 – 5 (n – 6, n – 7……)
- .06, .08, .12, .06, .36, .04, ___, ___,
1) 1.42, .02
2) 1.42, .0
3) 1.44, .04
4) 1.44, .02
5) 1.44, .0
Ans: 4) (.06 x 2), (n x 2) (.08 – 2), (n – 2)
- 78, 45, 70, 53, 62, 61, ___, ___,
1) 54, 68
2) 54, 69
3) 54, 70
4) 53, 69
5) 53, 70
Ans: 2) (78 – 8); (n – 8); (45 + 8); (n + 8)
- .001, .0011, .0001, .00111, .00001, ____, ____,
1) .001111, .000001
2) .000111, 00001
3) .0001111, .0000
4) .00111, .00001
5) .00111, .000011
Ans: 1) 1st -3rd -5th nos ….. adding more 0’s
2nd -4th -6thnos ….. adding more 1’s
- 2.5, 4.5, 4, 6, 5.5, 7.5, ___, ___,
1) 7,8
2) 9, 9.5
3) 7.5, 9.5
4) 9.5, 9.0
5) 8.5, 9.5
Ans: 1) n + 1.5
- 3 12/19, 4 13/20, 5 14/21, 6 16/22, ____, ____,
1) 6 15/22, 7 15/22
2) 7 15/23, 8 16/24
3) 7 15/22, 8 15/22
4) 7 15/22, 8 16/22
5) 7 16/23, 8 17/24
Ans: 5) 3 12/19 + 1 1/1
- 675, 430, 475, 630, ___, ___,
1) 230, 830
2) 330, 730
3) 730, 790
4) 275, 830
5) 270, 830
Ans: 4) n + 200, n – 200
- 341, 452, 563, ___, ___,
1) 675, 784
2) 674, 784
3) 675, 786
4) 675, 785
5) 674, 785
Ans: 5) each digit + 1
- 879, 768, 657, 546, ____, ____,
1) 437, 323
2) 435, 324
3) 547, 324
4) 556, 768
5) 438, 768
Ans: each digit decreases by 1
- 38, 67, 43, 72, 49, 78, ____, ____,
1) 57, 86
2) 56, 85
3) 57, 87
4) 56, 86
5) 56, 84
Ans: 2) (n + 5), (n + 6), (n + 7)…
- -4, -16, -64, -256, ____, ____,
1) -1024, -4097
2) -1025, -4097
3) -1024,- 4096
4) -1023, -4098
5) -1025, -4098
Ans: 3) (-n x 4)
- 438, 698, 548, 588, 658, ___, ___,
1) 478, 768
2) 478, 868
3) 488, 768
4) 478, 878
5) 488, 778
Ans: 1) (n + 110), (n – 110)
- AZ, CX, EV, GT, ___, ___,
1) IR, KP
2) IS, KQ
3) IS, KP
4) IR, KQ
5) IS, KR
Ans: 1) every other letter of the alphabet from the beginning together with the other letters starting from the end.
- AC, BD, EG, FH, ____, ____,
1) IL, HI
2) IK, JL
3) HI, JK
4) IJ, KL
5) IJ, KM
Ans: 2) 1st and 3rd letters together, 2nd and 4thletters, 5th and 7th and so on and so forth.
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