Find out the wrong number in the series given below : 1, 2, 6, 15, 31, 56, 91 A.      31 B.      15 C.      56 D.      91 Ans: 91 Sol: ∴91 is wrong.

A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in how many days? A.      1/24 Day B.      7/24 days C.      24/7 days D.      4 days Sol: (A+B+C)’s 1 day’s work =  ( 1/24 + 1/6 +1/12) = 7/24  So,

A and B can do a job in 12 days and B and C can do it in 16 days. A and B started working, without C. A worked for 5 days and quit. B worked for 7 days and quit. C worked for a total of 13 days and finished the work. In how

Find out the wrong number in the series given below : 396, 462, 572, 427, 671, 264. A. 396 B. 562 C. 572 D. 427 Sol: In each number except 427, the middle digit is the sum of other two digits.

Find out the wrong number in the series given below : 1, 2, 8, 33, 148, 760, 4626 A.      8 B.      148 C.      760 D.      4625 Sol: 2nd term  = 1st term × 1 + 12 = 1 × 1 + 12 = 2  3rd term  = 2nd term × 2 + 22 = 2

Find a wrong number in a series: 7, 28, 63, 124, 215, 342, 511. A.      7 B.      28 C.      124 D.      215 E.       342 Sol: Clearly the correct sequence is : 23−1,33−1,43−1,53−1,63−1,73−1,83−1. ∴28 is wrong and should be replaced with33−1 i.e. 26. Hence, the answer is (b).

Arun, Kamal and Vinay invested Rs. 8000, Rs. 4000 and Rs. 8000 respectively in a business. Arun left after six months. If after eight months, there was a gain of Rs. 4005, then what will be the share of Kamal? A. Rs.890 B. Rs.680 C. Rs.790 D. Rs.980 E. Rs.590 Sol: Arun : Kamal :

The marked price of an article is Rs. 300. It is sold for Rs. 177.84 after giving three successive discounts of 20%, x% and 5%. What is value of x ? A.      22 B.      18 C.      24 D.      15 Sol: Given:  Marked price = Rs.300  Three discounts = 20%, x% and 5%  Selling price =

Find out the wrong number in the series given below :15, 16, 34, 105, 424, 2124, 12756 A.      34B.      105C.      2124 D.      16 Sol: 2nd term = 1st term × 1 + 1 = 15 × 1 + 1 = 16  3rd term = 2nd term × 2 + 2 = 16 × 2 +