Series Set – 20

1) 14, 8, 9, 14.5 , 30, ?
A) 72
B) 74
C) 76
D) 78
E) 80

Answer & Explanation

 Option C
Explanation
: *0.5 +1, *1+1, *1.5+1, *2+1, *2.5+1

 

2) 77, 85, 69, 101, 37, ?
A) 101
B) -91
C) 145
D) 165
E) 170

Answer & Explanation

  Option D
Explanation
: +8, -16, +32,-64,+128

 

3) 7, 8, 18, 57, ? , 1165
A) 232
B) 142
C) 352
D) 432
E) 272

Answer & Explanation

 Option A
Explanation
: *1+1, *2+2, *3+3, *4+4,*5+5
57*4+4=232

 

4) 5, 7, 18, 47, 103, ?
A) 205
B) 215
C) 175
D) 195
E) 185

Answer & Explanation

 Option D
Explanation
: Difference of Difference
5,,,,,, 7,,,,,,,,,, 18,,,,,,,,,, 47,,,,,,,,, 103,,,,,,,,, ?
,,,,2,,,,,,,,11,,,,,,,,,,29,,,,,,,,,,56,,,,,,,,,,,(92)
,,,,,,,,,,9,,,,,,,,,,18,,,,,,,,,27,,,,,,,,,,(36)
The numbers in bracket are obtained by calculation
?=92+103=195

 

5) 20, 29, 54, 103, 184, ?
A) 235
B) 278
C) 315
D) 305
E) 333

Answer & Explanation

 Option D
Explanation
: +32, +52, +72, +92, +112
 

 

6)18,9.5, 10.5, 17.25, 36.5, ?
A) 76.50
B) 86.25
C) 93.75
D) 84.25
E) 78.50

Answer & Explanation

  Option C
Explanation
: *0.5 + 0.5, *1+1, *1.5+1.5, *2+2, *2.5 +2.5

 

7) 101, 108, 94, 122, 66, ?
A) 156
B) 128
C) 188
D) 178
E) 180

Answer & Explanation

  Option D
Explanation
: +7, -14, +28, -56, +112

 

8) 15, 16, 34, 105, ? ., 2125
A) 414
B) 424
C) 434
D) 444
E) 454

Answer & Explanation

 Option B
Explanation
: *1+1, *2+2, *3+3, *4+4, *5+5

 

9) 11, 14, 25, 52, 103, ?
A) 167
B) 156
C) 186
D) 174
E) 170

Answer & Explanation

 Option C
Explanation
: Difference of difference
11,,,,,,,,,,, 14,,,,,,,,,,, 25,,,,,,,,,,, 52,,,,,,,,,,, 103,,,,,,,,,,, ?
,,,,,,,,3,,,,,,,,,,,,,,11,,,,,,,,,,27,,,,,,,,,,,,51,,,,,,,,,,,,,,,83
,,,,,,,,,,,,,,,,8,,,,,,,,,,,,,16,,,,,,,,,,,,24,,,,,,,,,,,,,,,32

 

10) 10, 14, 30, 66, 130, ?
A) 210
B) 220
C) 230
D) 240
E) 250

Answer & Explanation

 Option C
Explanation
: +22, +42, +62, +102, +102

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