IBPS RRB PO Prelims 12 sep 2020 Questions and Answers Detailed Explanation
MOST IMPORTANT previous year question answers - 1 EXERCISES
Directions:
What should come in place of the question mark '?' in the following number series?
The following question based on IBPS RRB PO topic of previous year question answers
(a) 100
(b) 110
(c) 140
(d) 155
e) 165
The correct answers to the above question in:
Answer: (e)
The pattern of the series is: 77 + 8 × 1 = 85
85 – 8 × 2 = 69
69 + 8 × 4 = 101
101 – 8 × 8 = 37
37 + 8 × 16 = 165
Hence, the answer is E.
Shortcut : 2
Posted by : Rajesh singh
Posted Date: 2021-12-15 13:35:03
77+8=85
85-16=69
69+32=101
101-64=37
37+128=165
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Read more ibps rrb po prelims 12 sep 2020 Based Previous Year Questions and Answers
Question : 1
121, 123, 118, 128, ?, 137
a) 111
b) 115
c) 100
d) 105
e) 123
Answer »Answer: (a)
The pattern of the series is:
121 + 2 = 123
123 – (2 + 3) = 118
118 + (2 + 3 + 5) = 128
128 – (2 + 3 + 5 + 7) = 111
111 + (2 + 3 + 5 + 7 + 9) = 137
Hence, the answer is A.
Question : 2
7, 8, 18, 57, ?, 1165
a) 220
b) 224
c) 228
d) 232
e) 236
Answer »Answer: (d)
The pattern of the series is:
7 × 1 + 1 = 8
8 × 2 + 2 = 18
18 × 3 + 3 = 57
57 × 4 + 4 = 232
232 × 5 + 5 = 1165
Hence, the answer is D.
Question : 3
A and B can complete a work in 6 days. A, working alone can complete the same work in 9 days. In how many days, B alone can complete the $3/8$ of the work?
a) $25/4$
b) 9
c) $27/4$
d) $13/2$
e) 18
Answer »Answer: (c)
Let the total work = 18 units (LCM of 6 and 9)
Efciency of A and B together = $18/6$ = 3
Efciency of A alone = $18/9$ = 2
Efciency of B alone = Efciency of A and B together – Efciency of A alone
= 3 – 2 = 1
Hence, the required number of days = $3/8 x 18$ = $27/4$
Question : 4
20, 29, 54, 103, 184, ?
a) 315
b) 310
c) 305
d) 300
e) 295
Answer »Answer: (c)
The pattern of the series is:
20 + 32 = 29
29 + 52 = 54
54 + 72 = 103
103 + 92 = 184
184 + 112 = 305
Hence, the answer is C.
Question : 5
14, 8, 9, 14.5, 30, ?
a) 75
b) 76
c) 77
d) 78
e) 79
Answer »Answer: (b)
The pattern of the series is:
14 × .5 + 1 = 8
8 × 1 + 1 = 9
9 × 1.5 + 1 = 14.5
14.5 × 2 + 1 = 30
30 × 2.5 + 1 = 76
Hence, the answer is B.
Directions:
In each of the questions given below, some statements are followed by some conclusions. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusions logically follows from the given statements disregarding commonly known facts.
Question : 6
- Statements:
- Some Tables are Chairs.
- Some Sofa are Desks.
- No Chair is Desk.
- Conclusions:
- I. Some Chairs are not Sofa.
- II. All Chairs are Sofa.
a) Only conclusion I follows
b) Only conclusion II follows
c) Both conclusions I and II follow
d) Neither conclusion I nor II follows
e) Either conclusion I or II follows
Answer »Answer: (e)
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