# Quantitative Aptitude Practice Questions for Bank Exams, RBI Assistants, IPPB Mains

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
e) None of these
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+3=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.