Missing Numbers Quiz Set 028 | Missing Numbers Type of Questions for Aptitude and Reasoning Exams Set 28 | Online self tests for IBPS, Clerical, SO, SSC, SSB, NTSE, Mental Ability Exams

**Your Score**
Correct Answers:
Wrong Answers:
Unattempted:

Question 1

One term in the number series is wrong. Find out the wrong term.

10, 13, 26, 37, 51, 85, 154

154

Soln.
Ans: c

10 + 16 = 26, then 13 + 24 = 37, then 26[the first term] + 32 = 58 and then 85 = 37[the second term] + 48, hence, the wrong term is 51.

Solution | Discuss! | Chapters»

Question 2

In the following number series, one of the numbers does not fit into the series. Find the wrong number.

2, 6, 24, 96, 285, 568, 567

285

Soln.
Ans: b

Number 24 is wrong and should be replaced by 25. The series should be 2 X 6 - 6 = 6, then 6 X 5 - 5 = 25, 25 X 4 - 4 = 96, then 96 X 3 - 3 = 285, then 285 X 2 - 2 = 568, then 568 X 1 - 1 = 567.

Solution | Discuss! | Chapters»

Question 3

In the following number series, one of the numbers does not fit into the series. Find the wrong number.

225, 289, 338, 374, 397, 415, 424

415

289

338

397

Soln.
Ans: d

Number 397 is wrong and should be replaced by 399. The series is 225 + 8² gives 289, then 289 + 7² gives 338, then 338 + 6² gives 374, then 374 + 5² should give 399 not 397.

Solution | Discuss! | Chapters»

Question 4

Directions: Find the missing number in the following series.

77, 78, 77, 81, 73, ?, 55

Soln.
Ans: c

Series increases and decreases alternatively with a difference of +1², −1³, +2², −2³, +3², −3³, i.e., +1, −1, +4, −8, +9, −27. The missing number is 73 + 3² = 82.

Solution | Discuss! | Chapters»