RRB Group D Number Series — practice questions

Explore 3 free Number Series questions in RRB Group D Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.

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Number Series questions and exercises with answers

Showing questions 1–3 of 3.

Find the missing term: 12, 20, 34, 57, ?Read the answer and worked solution →Complete the number series: 32, 64, 256, 1536, ?, 122880, 1474560Read the answer and worked solution →Double 150 all the way to 1200Read the answer and worked solution →

Worked practice questions

Find the missing term: 12, 20, 34, 57, ?

93
93.5
94
93.25

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Correct answer: B. 93.5

1. The rule is ×1.5 then add 2, 4, 6, 8 successively. 2. 12×1.5 + 2 = 20; 20×1.5 + 4 = 34; 34×1.5 + 6 = 57. 3. Next: 57 × 1.5 + 8 = **93.5**. _Source: IBPS RRB Officer Scale I Prelims PYQ (Examrace), Q.74_

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Complete the number series: 32, 64, 256, 1536, ?, 122880, 1474560

12286
12288
12270
12285

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Correct answer: B. 12288

1. Each term multiplies by an increasing even number: ×2, ×4, ×6, ×8, ... 2. So the missing term = 1536 × 8 = 12288. 3. Check: 12288 × 10 = 122880 and 122880 × 12 = 1474560. _Source: RRB Group D CEN-02/2018 PYQ, Q.24._

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Double 150 all the way to 1200

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Sequence

Item
150
Item
300
Item
600
Item
1200

Instructions

Tap two tiles that show the same number. They join into one tile worth double that number.

_Source: RRB Group D CEN-02/2018 PYQ, Q.32._

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