Directions (1-5): Find the wrong number in the following series.
Question 1. 12 42 156 606 2400 ?
A. 9186
B. 9470
C. 9570
D. 9486
E. None of these.
Explanation
C)
12*4 – 6
42*4 – 12
156*4 – 18
606*4 – 24
2400*4 – 30 = 9570
Question 2. 331, 482, 551, 263, 383, 362, 284
A. 263
B. 383
C. 331
D. 551
E. 362
Explanation
B)
In each number except 383, the product of first and third digits is the middle one.
Question 3. 15, 16, 34, 105, 424, 2124, 12756
A.16
B.34
C.105
D.424
E.2124
Explanation
A)
Rs.20000 after 4 years =20000(1+10/100)^4==Rs. 29282
Rs.20000 after 3 years=20000(1+10/100)^3=Rs. 26620
Rs. 20000 after 2 years =20000(1+10/100)^2=Rs. 24200
Rs.20000 after 1 year =20000(1+10/100)=Rs. 22000
Total amount after 4 years = 29282 + 26620 + 24200 + 22000 = Rs. 102102
Question 4. 582, 605, 588, 611, 634, 617, 600
A) 634
B) 611
C) 605
D) 600
E) 582
Explanation
A) 634
Explanation:
Alternatively 23 is added and 17 is subtracted from the terms. So, 634 is wrong.
Question 5. 36, 54, 18, 27, 9, 18.5, 4.5
A) 4.5
B) 18.5
C) 54
D) 18
E) 27
Explanation
B) 18.5
Explanation:
The terms are alternatively multiplied by 1.5 and divided by 3. However, 18.5 does not satisfy it
