Number Series Questions and Answers Quiz 2

1 . Directions (1-5):In each question below, a number series is given in which one number is wrong, Find out the wrong number. $484\,\,\, 240\,\,\, 120\,\,\, 57\,\,\, 26.5\,\,\, 11.25\,\,\, 3.625$ A.   240 B.   120 C.   57 D.   26.5 2 . $3\,\,\, 5\,\,\,\ 13\,\,\, 43\,\,\, 176\,\,\, 891\,\,\, 5353$ A.   5 B.   13 C.   43 D.   176 3 . $6\,\,\, 7\,\,\,\, 16\,\,\, 41\,\,\, 90\,\,\, 154\,\,\, 292$ A.   7 B.   16 C.   41 D.   154 4 . $5\,\,\, 7\,\,\, 16\,\,\, 57\,\,\, 244\,\,\, 1245\,\,\, 7506$ A.   7 B.   16 C.   244 D.   57 5 . $4\,\,\, 2.5\,\,\, 3.5\,\,\, 6.5\,\,\, 15.5\,\,\, 41.25\,\,\, 126.75$ A.   2.5 B.   3.5 C.   6.5 D.   15.5 6 . Directions (6-10):What should come in place of the question mark(?) in the following number series. $325\,\,\, 314\,\,\, 292\,\,\, 259\,\,\, 215\,\,\, ?$ A.   126 B.   116 C.   130 D.   160 7 . $45\,\,\, 46\,\,\, 70\,\,\, 141\,\,\, ?\,\,\, 1061.5$ A.   353 B.   353.5 C.   352.5 D.   352 8 . $620\,\,\, 632\,\,\, 608\,\,\, 644\,\,\, 596\,\,\, ?$ A.   536 B.   556 C.   656 D.   646 9 . $15\,\,\, 25\,\,\, 40\,\,\, 65\,\,\, ?\,\,\, 195$ A.   115 B.   90 C.   105 D.   None 10 . $120\,\,\, 320\,\,\, ?\,\,\, 2070\,\,\, 5195\,\,\, 13007.5$ A.   800 B.   920 C.   850 D.   None

Answers & Solutions   1 .     Answer : Option B Explanation : The pattern of the number series is: (484 ÷2) – 2 =242 – 2 = 240 (240 ÷ 2) – 2 = 120 – 2 = 118 ≠105 (118 ÷ 2) – 2 = 59 – 2 = 57 (57 ÷ 2) – 2 = 28.5 – 2 = 26.5 2 .     Answer : Option D Explanation : The pattern of the number series is : 3 × 1 + 2 = 5 5 × 2 + 3 = 13 13 × 3 + 4 = 43 43 × 4 + 5 = 177 ≠176 177 × 5 + 6 = 891 3 .     Answer : Option D Explanation : The pattern of the number series is : $6 + 1^ 2$ = 6 + 1 = 7 $7 + 3^ 2$ = 7 + 9 = 16 $16 + 5^ 2$ = 16 + 25 = 41 $41 + 7^ 2$ = 41 + 49 = 90 $90 + 9^ 2$ = 90 + 81 = 171 ≠ 154 $171 + 11^ 2$ = 171 + 121 = 292 4 .     Answer : Option A Explanation : The Pattern of the number series is : $5 × 1 + 1^ 2$ = 6 ≠ 7 $6 × 2 + 2^ 2$ = 16 $16 × 3 + 3^ 2$ = 57 $57 × 4 + 4^ 2$ = 228 + 16 = 244 $244 × 5 + 5^ 2$ = 1220 + 25 = 1245 5 .     Answer : Option C Explanation : The Pattern of the number series is : 4 × 0.5 + 0.5 = 2 + 0.5 = 2.5 2.5 × 1 + 1 = 3.5 3.5 × 1.5 + 1.5 = 6.75 ≠6.5 6.75 × 2 + 2 = 15.5 15.5 × 2.5 + 2.5 = 38.75 + 2.5 = 41.25 41.25 × 3 + 3 = 123.75 + 3 = 126.75 6 .     Answer : Option D Explanation : The Pattern of the number series is : 325 – 1 × 11 = 314 314 – 2 × 11 = 292 292 – 3 × 11 = 259 259 – 4 × 11 = 215 215 – 5 × 11 = 160 7 .     Answer : Option B Explanation : The Pattern of the number series is : 45 × 1 + 1 = 46 46 × 1.5 + 1 = 70 70 × 2 +1 = 141 141 × 2.5 + 1 = 352.5 + 1 = 353.5 8 .     Answer : Option C Explanation : The Pattern of the number series is : 620 + 1 × 12 = 632 632 – 2 × 12 = 608 608 + 3 × 12 = 644 644 – 4 + 12 = 596 596 + 5 × 12 = 656 9 .     Answer : Option D Explanation : The Pattern of the number series is : 15 × 2 – 1 × 5 = 25 25 × 2 – 2 × 5 = 40 40 × 2 – 3 × 5 = 65 65 × 2 – 4 × 5 = 110 110 × 2 – 4 × 5 = 195 10 .     Answer : Option D Explanation : The Pattern of the number series is : 120 × 2.5 + 20 = 320 320 × 2.5 + 20 = 820 820 × 2.5 + 20 = 2070 2070 × 2.5 + 20 = 5195