Directions: The following series are based on a certain pattern. Find the number represented by question mark (?) in the following series:
- 3 4 ? 11 25 78
96.54.556Option C
Solution:
*1+1, *1.5-1.5, *2+2, *2.5-2.5, *3+3
4*1.5 – 1.5=4.5.
- 1 6 33 170 ? 4294
857755812923778Option A
Solution:
*5+1, *5+3, *5+5, *5+7, *5+9
170*5 +7=857.
- 4 ? 16 42 92 174
10612811Option B
Solution:
+12+1, +32+1, +52+1, +72+1, +92+1
4+12+1=6.
- 6 6 8 11 14.5 ?
17.2518.517.7518.2519.50Option D
Solution:
/2+3, /2+5, /2+7, /2+9, /2+11
14.5/2+11=18.25.
- 4 6 12 ? 30 42
22261816
None of theseOption C
Solution:
4 (3 and 5 are prime no)
6 (5 and 7 are prime no)
12 (11 and 13 are prime no)
18 (17 and 19 are prime no)
30 (29 and 31 are prime no)
42 (41 and 43 are prime no).
- 21 32 ? 87 131 186
5465736870Option A
Solution:
+11*1, +11*2, +11*3, +11*4, +11*5
32+(11*3)=54.
- 5 12 24 ? 52 68
48364238None of theseOption B
Solution:
2+3 , 5+7 , 11+13 , 17+19 , 23+29 , 31+37
17+19=36.
- 13 17 ? 37 53 73
2125323520Option B
Solution:
+4, +8, +12, +16, +20
17+8=25.
- 3 7 19 55 163 ?
487366389435None of theseOption A
Solution:
3 7 19 55 163 487(163+324)
. 4 12 36 108 324
4*3=12, 12*3=36, 36*3=108, 108*3=324.
- 11 16 23 32 43 ?
64736756None of theseOption D
Solution:
11 16 23 32 43 56
. 5 7 9 11 13
7 ?
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