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Directions:(1-10) What will come in place of the question mark (?) in the following number series?
1. 286, 142, ?, 34, 16, 7
2. 18, 19, 40, 123, 496, 2485, ?
3. 10, 22, 8, 24, 6, ?
4. 7, 9, 19, 45, 95,?
5. 18, 27, 49 ,84, 132 ,(?)
6.18, 20, 44, 138, 560, 2810, ?
7. 1, 5, 17, 53, 161, ?
8. 32, 55, 74, 91, 104, ?, 122
9. 5, 45, 315, 1575, 4725, ?
10. 65, 54 ,64 ,55 ,63 ?
Check your Answers below:
Directions:(1-10) What will come in place of the question mark (?) in the following number series?
1. Question
286, 142, ?, 34, 16, 7
Ans:5
2. Question
18, 19, 40, 123, 496, 2485, ?
Ans:3
18
18*1+1 = 19
19*2+2 = 40
40*3+3 = 123
123*4+4 = 496
496*5+5 = 2485
2485*6+6 = 149163. Question
10, 22, 8, 24, 6, ?
Ans:3
4. Question
7, 9, 19, 45, 95,?
Ans:4
5. Question
18 27 49 84 132 (?)
Ans:4
So, ? = 1936. Question
18, 20, 44, 138, 560, 2810, ?
Ans:4
The pattern of the series can be judged by the logical sequence given below:18 * 1 + 2 = 20
20 * 2 + 4 = 44
44 * 3 + 6 = 138
138 * 4 + 8 = 560
560 * 5 + 10 = 2810
2810 * 6 + 12 = 16872Note: After getting the idea of pattern, no need to exactly calculate the last number (we can clearly understand that 2 will come at the unit digit place, so mark the answer as 16872)
7. Question
1, 5, 17, 53, 161, ?
Ans:4
The pattern of the series can be judged by the logical sequence given below:1 5 17 53 161 485
+4 +12 +36 +108 +324
*3 *3 *3 *38. Question
32, 55, 74, 91, 104, ?, 122
Ans:2
The pattern of the series can be judged by the logical sequence given below:32 55 74 91 104 115 122
23 19 17 13 11 7Difference of prime numbers.
9. Question
5, 45, 315, 1575, 4725, ?
Ans:4
The pattern of the series can be judged by the logical sequence given below:5 * 9 = 45
45 * 7 = 315
315 * 5 = 1575
1575 * 3 = 4725
4725 * 1 = 472510. Question
65 54 64 55 63 ?
Ans:3
Series is sum and differences both as:-
65−11=54
54+10=64
64−9=55
55+8=63
63−7=56