Missing Numbers
What should come in place of the question mark (?) in the following number series?
1. 5690 5121 4552 3983 3414 2845 ?
(a) 2276
(b) 2516
(c) 2746
(d) 2356
(e) None of these
Answer: (a)
Explanation:
By Subtracting 569,We Get the Next Term,
5690-569=5121
5121-569=4552
4552-569=3983
3983-569=3414
3414-569=2845
2845-569=2276
2.16 8 12 30 105 ?
(a) 387.5
(b) 470.5
(c) 367.5
(d) 472.5
(e) None of these
Answer: (d)
Explanation:
16*1/2=8
8*3/2=12
12*5/2=30
30*7/2=105
105*9/2=472.5
3. 3 7 19 55 163 ?
(a) 467
(b) 487
(c) 475
(d) 485
(e) None of these
Answer: (b)
Explanation:
3
7=3+4
19=7+4*3
55=19+12*3
163=55+36*3
487=163+108*3
4. 11 16 23 32 43 ?
(a) 55
(b) 57
(c) 58
(d) 59
(e) None of these
Answer: (e)
Explanation:
The difference is 5,7,9,11.
It increases by every consecutive odd number.
5. 15 19 ? 27 31
(a) 21
(b) 23
(c) 20
(d) 25
(e) None of these
Answer: (b)
Explanation:
It increases by 4.
6. 2 5 7 12 19 31 ?
(a) 50
(b) 43
(c) 49
(d) 54
(e) None of these
Answer: (a)
Explanation:
Its a Fibonacci series .
So, 2+3=5
5+2=7
7+12=19
19+12=31
31+19=50
7. 1 4 9 ? 25
(a) 15
(b) 17
(c) 14
(d) 20
(e) None of these
Answer: (e)
Explanation:
They’re the square numbers..
1² (1 x 1) = 1
2² (2 x 2)= 4
3² (3 x 3 )= 9
4² (4 x 4) = 16
5² (5 x 5) = 25
8. 106 ? 94 88 82
(a) 102
(b) 112
(c) 96
(d) 100
(e) None of these
Answer: (d)
Explanation:
Subtracting 6 from the previous number.
9. 17 19 16 20 ? 21
(a) 14
(b) 17
(c) 15
(d) 19
(e) None of these
Answer: (c)
Explanation:
17+2=19
19-3=16
16+4=20
20-5=15
15+6=21
10. 2 3 6 15 45 ?
(a) 135
(b) 90
(c) 75
(d) 145
(e) None of these
Answer: (e)
Explanation:
Increasing by 0.5 Multiplier to the previous multiplier .
2 x 1.5 = 3
3 x 2.0 = 6
6 x 2.5 = 15
15 x 3.0 = 45
45 x 3.5 = 157.5
157.5 x 4.0 = 630