PE 1 - Number Series | LR - Series
1, 9, 25, 49, ?
- (a)
81
- (b)
64
- (c)
100
- (d)
36
Answer: Option A
Explanation :
Here the series is squares of odd numbers i.e., 12, 32, 52, 72 and so on.
∴ The next term will be 92 = 81
Hence, option (a).
Workspace:
0, 1, 1, 2, 3, 5, 8, ?
- (a)
16
- (b)
13
- (c)
25
- (d)
20
Answer: Option B
Explanation :
Here each term is the sum of preceding two terms.
∴ The next term will be = 5 + 8 = 13.
Hence, option (b).
Workspace:
13, 23, 43, 73, 113, ?
- (a)
153
- (b)
143
- (c)
173
- (d)
163
Answer: Option D
Explanation :
Here each subsequent term increases by consecutive multiple of 10 i.e., +10, +20, +30, +40, +50 and so on.
∴ The next term will be = 113 + 50 = 163.
Hence, option (d).
Workspace:
17, 29, 53, 89, 137, ?
- (a)
197
- (b)
209
- (c)
185
- (d)
180
Answer: Option A
Explanation :
Here each subsequent term increases by consecutive multiples of 12 i.e., +12, +24, +36, +48 and so on.
∴ The next term will be = 137 + 60 = 197.
Hence, option (a).
Workspace:
13, 26, 23, 46, 43, 86, ?
- (a)
83
- (b)
82
- (c)
81
- (d)
84
Answer: Option A
Explanation :
Here the pattern is × 2, - 3, × 2, - 3, × 2, - 3 and so on.
∴ The next term will be = 86 – 3 = 83.
Hence, option (a).
Workspace:
14, 31, 65, 133, ?
- (a)
242
- (b)
269
- (c)
253
- (d)
287
Answer: Option B
Explanation :
Here each term of the series is the preceding number multiplied by 2 and then increased by 3 i.e.,
31 = 2 × 14 + 3
65 = 2 × 31 + 3
133 = 2 × 65 + 3
and so on.
∴ The next term will be = 133 × 2 + 3 = 269.
Hence, option (b).
Workspace:
6, 20, 42, 72, 110, ?
- (a)
123
- (b)
181
- (c)
146
- (d)
156
Answer: Option D
Explanation :
Here the series follows as + 14, + 22, + 30, + 38 and so on.
∴ The next term will be = 110 + 46 = 156.
Hence, option (d).
Workspace:
6, 18, 55, 167, 504, ?
- (a)
1581
- (b)
1585
- (c)
1556
- (d)
1516
Answer: Option D
Explanation :
Here the series is:
18 = 6 × 3 + 0,
55 = 18 × 3 + 1,
167 = 55 × 3 + 2,
504 = 167 × 3 + 3
… and so on.
∴ The next term will be = 504 × 3 + 4 = 1516.
Hence, option (d).
Workspace:
1200, 240, 60, 20, ?
- (a)
14
- (b)
10
- (c)
12
- (d)
2
Answer: Option B
Explanation :
Here the series is:
1200 ÷ 5 = 240,
240 ÷ 4 = 60,
60 ÷ 3 = 20,
and so on.
∴ The next term will be = 20 ÷ 2 = 10.
Hence, option (b).
Workspace:
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