Number Series Questions and Answers Quiz 1

1 . Directions (1-5):In the following number series only one number is wrong.Find out the wrong number. $13\,\,\, 25\,\,\, 40\,\,\, 57\,\,\, 79\,\,\, 103\,\,\, 130$ A.   25 B.   40 C.   57 D.   79 2 . $850\,\,\,\, 600\,\,\,\, 550\,\,\,\, 500\,\,\,\, 475\,\,\,\, 462.5\,\,\, 456.25$ A.   600 B.   550 C.   500 D.   462.5 3 . $2\,\,\, 10\,\,\, 18\,\,\, 54\,\,\, 162\,\,\, 486\,\,\, 1458$ A.   18 B.   54 C.   162 D.   10 4 . $8\,\,\, 12\,\,\, 24\,\,\, 46\,\,\, 72\,\,\, 108\,\,\, 152$ A.   12 B.   24 C.   46 D.   72 5 . $142\,\,\, 119\,\,\, 100\,\,\, 83\,\,\, 65\,\,\, 59\,\,\, 52$ A.   65 B.   100 C.   59 D.   119 6 . Directions (6-10):What should come in place of the question mark in the following number series? $5\,\,\, 54\,\,\, 90\,\,\, 115\,\,\, 131\,\,\, 140\,\,\, ?$ A.   149 B.   149 C.   146 D.   144 7 . $7\,\,\, 4\,\,\, 5\,\,\, 9\,\,\, ?\,\,\, 52.5\,\,\, 160.5$ A.   32 B.   16 C.   14 D.   20 8 . $6\,\,\, 42\,\,\, ?\,\,\, 1260\,\,\, 5040\,\,\, 15120\,\,\, 30240$ A.   546 B.   424 C.   252 D.   325 9 . $4\,\,\, 10\,\,\, 40\,\,\, 190\,\,\, 940\,\,\, ?\,\,\, 23440$ A.   4690 B.   2930 C.   5140 D.   3680 10 . $2\,\,\, 9\,\,\, 30\,\,\, ?\,\,\, 436\,\,\, 2195\,\,\, 13182$ A.   216 B.   105 C.   178 D.   324

Answers & Solutions   1 .     Answer : Option C Explanation : The pattern is : 13 + 12 = 25 ; 25 + 15 = 40 40 + 18 = 58 ≠ 57 58 + 21 = 79 2 .     Answer : Option A Explanation : The pattern is : 850 – 200 = 650 ≠ 600 650 – 100 = 550 550 – 25 = 475 475 – 12.5 = 462.5 3 .     Answer : Option D Explanation : The pattern is : 2 × 3 = 6 ≠ 10 6 × 3 = 18 ; 18 × 3 = 54 54 × 3 = 162 4 .     Answer : Option C Explanation : The pattern is : 8 + 4 × 1 = 12 ; 12 + 4 × 3 = 24 24 + 4 × 5 = 44 ≠ 46 44 + 4 × 7 = 72 72 + 4 × 9 = 108 5 .     Answer : Option A Explanation : The pattern is : 142 – 23 = 119 ; 119 – 19 = 100 100 – 17 = 83 83 – 13 = 70 ≠ 65 70 – 11 = 59 59 – 7 = 52 6 .     Answer : Option D Explanation : The pattern is: $5 + 7^2 $ = 54 $54 + 6^ 2$ = 90 $90 + 5^ 2$ = 115 $115 + 4^ 2$ = 131 $131 + 3^ 2$ = 140 $140 + 2^ 2$ = 140 + 4 = 144 7 .     Answer : Option D Explanation : The pattern is : 7 × 0.5 + 0.5 = 3.5 + 0.5 = 4 4 × 1 + 1 = 4 + 1 = 5 5 × 1.5 + 1.5 = 7.5 + 1.5 = 9 9 × 2 + 2 = 18 + 2 = 20 8 .     Answer : Option C Explanation : The pattern is : 6 × 7 = 42 42 × 6 = 252 252 × 5 = 1260 9 .     Answer : Option A Explanation : The pattern is : 4 × 5 – 10 = 10 10 × 5 – 10 = 40 40 × 5 – 10 = 190 190 × 5 – 10 = 940 940 × 5 – 10 = 4700 – 10 = 4690 10 .     Answer : Option B Explanation : The pattern is : 2 × 1 + 1 × 7 = 9 9 × 2 + 2 × 6 = 30 30 × 3 + 3 × 5 = 105 105 × 4 + 4 × 4 = 436 436 × 5 + 5 × 3 = 2195