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# DSSSB 2020: Reasoning Questions Based on Number Series Completion: 23rd January 2020

## Reasoning Questions For DSSSB 2020 Exam

The reasoning is the most scoring section in any competitive exam. It also develops or nourishes our critical thinking skills as compared to other subjects. In DSSSBKVS, HSSC Exam as a student to score well in this part, you have to start your preparation now because there is negative marking as well. The more you have prepared, the better you score.So today we are providing Reasoning Questions based on the topic Number Series Completion to improve your particular section.

Directions: (Q1-3) Find the missing number in the following series:निर्देश: (प्र.1-3) निम्नलिखित श्रृंखला में लुप्त संख्या ज्ञात कीजिए:Q1. 42, 48, 60, 66, ?, 93, 105(a) 72(b) 78(c) 79(d) 82
Q2. 40, 29, 20, 13, ?(a) 3(b) 4(c) 8(d) 7
Q3. 2, 10, 60, 420, 3360, ?(a) 30240(b) 27840(c) 25140(d) 22240
Directions (Q4 to7): In the given questions below find the missing number.निर्देश (प्र.4 to7): नीचे दिए गए प्रश्नों में लापता संख्या ज्ञात कीजिएQ4. 40 32 72 1230 24 54 954 ? 90 15(a) 49(b) 46(c) 48(d) 36
Q5. 25 15 40 865 25 90 ?45 15 60 12(a) 6(b) 12(c) 18(d) 24
Q6. 6 11 258 6 1612 5 ?(a) 12(b) 16(c) 18(d) 22

(a) 80(b) 64(c) 112(d) 48

(a) 36(b) 117(c) 52(d) 26

(a) 30(b) 24(c) 18(d) 12

(a) 2031(b) 731(c) 1625(d) 1

Solutions

S1. Ans.(b)Sol. Sum of the digits of each term is added to it to obtain the next term.4+2 = 6 + 42 = 484+8 = 12 + 48 = 606+0 = 6 + 60 = 666+6 = 12 + 66 = 787+8 = 15 + 78 = 939+3 = 12 + 93 = 105
S2. Ans.(c)Sol. Successively 11, 9, 7, … is subtracted to obtain the next term.
S3. Ans.(a)Sol. The terms are successively multiplied by 5, 6, 7, …..
S4. Ans.(d)Sol. 40 32 72 1230 24 54 954 ? 90 15
First row: 40+32= 72; 72×1/6 = 12Second row: 30+24 = 54; 54×1/6 = 9Third row: 54+? = 90; 90-54 = 36∴ Missing number is 36.
S5. Ans.(c)Sol. 25 15 40 865 25 90 ?45 15 60 12
First row: 25+15 = 40; 40×1/5 = 8Second row: 65+25 = 90; 90×1/5 = 18Third row: 45+15 = 60; 60×1/5 = 12∴ Missing number is 18
S6. Ans.(b)Sol. In each row, (i) multiply the second term by 2. (ii) divide the first term by 2 then add the (i) product + (ii) quotient to obtain the third term.11×2+ (6÷2) = 256×2+ (8÷2) = 165×2+(12÷2)= 16
S7. Ans.(c)Sol. (14)²= 196; 196÷2 = 98; 98-14 = 84;(10)²= 100; 100÷2 = 50; 50-10 = 40;(12)²= 144; 144÷2 = 72; 72-12 = 60;(16)²= 256; 256÷2 = 128; 128-16 = 112.Therefore, missing number is 112.
S8. Ans.(a)Sol. 5+4= 9; 5×4= 20;3+8= 11; 3×8= 24;9+4= 13;  9×4= 36.∴ Missing number is 36.
S9. Ans.(b)Sol. 6+7= 13, 6×7= 42;4+9= 13, 4×9= 36;8+3= 11,  8×3= 24.∴ Missing term is 24.
S10. Ans.(a)Sol. (3×5) +1= 16(16×5)+1= 81(81×5)+1= 406(406×5)+1= 2031

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