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# Number Series Questions and Answers Quiz 2

IBPS EXAM Guru

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

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 = 55 × 2 + 3 = 1313 × 3 + 4 = 4343 × 4 + 5 = 177 ≠176177 × 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 = 2.52.5 × 1 + 1 = 3.53.5 × 1.5 + 1.5 = 6.75 ≠6.56.75 × 2 + 2 = 15.515.5 × 2.5 + 2.5 = 38.75 + 2.5 = 41.2541.25 × 3 + 3 = 123.75 + 3 = 126.75
6 .
 Answer : Option D Explanation : The Pattern of the number series is :325 – 1 × 11 = 314314 – 2 × 11 = 292292 – 3 × 11 = 259259 – 4 × 11 = 215215 – 5 × 11 = 160
7 .
 Answer : Option B Explanation : The Pattern of the number series is :45 × 1 + 1 = 4646 × 1.5 + 1 = 7070 × 2 +1 = 141141 × 2.5 + 1= 352.5 + 1 = 353.5
8 .
 Answer : Option C Explanation : The Pattern of the number series is :620 + 1 × 12 = 632632 – 2 × 12 = 608608 + 3 × 12 = 644644 – 4 + 12 = 596596 + 5 × 12 = 656
9 .
 Answer : Option D Explanation : The Pattern of the number series is :15 × 2 – 1 × 5 = 2525 × 2 – 2 × 5 = 4040 × 2 – 3 × 5 = 6565 × 2 – 4 × 5 = 110110 × 2 – 4 × 5 = 195
10 .
 Answer : Option D Explanation : The Pattern of the number series is :120 × 2.5 + 20 = 320320 × 2.5 + 20 = 820820 × 2.5 + 20 = 20702070 × 2.5 + 20 = 5195