Directions (1
– 10): What will come in the place of question mark (?) in the below series:
1. 2, 5, 16,
?, 240, 1215
a)
58
b)
57
c)
147
d)
163
2. 2, 18,
95, ?, 1155, 2312
a)
129
b)
56
c)
384
d)
200
e) None
of these
3. 3, 5, ?,
17, 33, 65
a)
12
b) 9
c)
38
d) 20
e)
None of these
4. 5 6
? 57 244
a) 21
b) 16
c) 17
d) 15
e) None
of these
5. 5 11
? 55 117
a) 21
b) 27
c) 23
d) 25
e) None
of these
6.
64 126 218 346
516 ?
a) 732
b) 734
c) 729
d) 764
e) 812
7.
? 8 15
24 35 48
a) 2
b) 3
c) 4
d) 5
e) 1
8.
? 8 20
40 70 112
a) 0
b) 5
c) 4
d) 6
e) 2
9.
3 9 21
47 111 ?
a) 250
b) 243
c) 285
d) 249
e) 263
10.
1/3 1/2 3/5
2/3 5/7 ?
a) 3/4
b) 4/9
c) 7/10
d) 5/9
e) 4/7
Solutions:
1. B) the series
pattern is
2 × 1 + 3 = 5; 5 × 2 + 6 = 16; 16 × 3 + 9 = 57; 57 × 4 + 12 =
240; 240 × 5 + 15 = 1215
2. C) the series pattern is
2 × 6 + 6 = 18; 18 × 5 + 5 = 95; 95 × 4 + 4 = 384; 384 × 3 +
3 = 1155; 1155 × 2 + 2 = 2312
3. B) the series pattern is
3 × 2 – 1 = 5; 5 × 2 – 1 = 9; 9 × 2 – 1 = 17; 17 × 2 – 1 =
33; 33 × 2 – 1 = 65
4. B) The given series is based on the
following pattern:
5 × 1 + (1)2 = 6
6 × 2 + (2)2 = 16
16 × 3 + (3)2 = 57
57 × 4 + (4)2 = 224
5. D) The given series is based on the
following pattern:
5 × 2 + 1 = 11
11 × 2 + 3 = 25
25 × 2 + 5 = 55
55 × 2 + 7 = 117
6. B) The series is 4³+0, 5³+1, 6³+2, 7³+3,
8³+4, 9³+5.
Hence, ?
=9³+5=729+5=734
7. B) The series is 1×2+1, 2×3+2, 3×4+3,
4×5+4, 5×6+5, 6×7+6,
∴ ?=1×2+1=3
8. E) The series is (1×2×3)/3, (2×3×4)/3,
(3×4×5)/3, (4×5×6)/3, (5×6×7)/3, (6×7×8)/3
∴ ?=(1×2×3)/3=2
9. C) The series is 1×2+3⁰, 2×3+3¹, 3×4+3²,
4×5+3³, 5×6+3⁴, 6×7+3⁵,…..
∴ ? =6×7+3⁵=42+243=285
10. A) The series is 1×2 / 2×3, 2×3 / 3×4,
3×4 / 4×5, 4×5 / 5×6, 5×6 / 6×7, 6×7 / 7×8
∴ ? =6×7 / 7×8= 6/8 =3/4.
