Number Series Questions and Answers PDF Notes in Hindi

Number Series Reasoning Notes for Coaching Classes, Questions and Answers, Online Practice test and PDF in Hindi for free Download.

There are two type of Questions asked in competitive exams :
Find the missing number
Spot the wrong number

Difference of Numbers are equal /संख्याओं का अंतर बराबर है

Ex: 1, 4, 7, 10, 13, 16, 19, 22, ?

Solution : Addition of 3, therefore, 22+3 =25

Difference of Difference of Numbers are equal / संख्याओं के अंतर के अंतर समान हैं

Ex: 3, 10, 20, 33, 49, 68, ?

31020334968? (68+22=90)
71013161919+3=22
33333

Difference of Difference of Difference of Numbers are equal

Ex: 3, 8, 18, 35, ?, 98

381835? (35+26=61)61+37=98
5101717+9=2626+11=37
57911
222

Two Series / दो श्रृंखला

Ex: 4, 28, 6, 26, 8, 24, 10, 22, 12, ?

Two different series 4,6,8,10,12…. and 28,26,24,22,20…

Answer is 20

Three Series / तीन श्रृंखला

Ex: 0, 4, 6, 3, 7, 9, 6, ?, 12

Three different series with addition of 3
0,3,6,9, …
4,7,10,13…
6,9,12,15…
Answer is 10

Prime Number Series / अभाज्य संख्या श्रृंखला

Ex: 2, 3, 5, 7, 11, 13, 17, 19, 23, ?

Series of Prime numbers and next is 23

Mathematical Operations

Ex: 3, 4, 10, 33, ?

3×1+1 =4, 4×2+2=10, 10×3+3=33, 33×4+4=136

Square of Numbers / संख्याओं का वर्ग

Ex: 1, 4, 9, 16, 25, 36,49, ?

Square of 1,2,3,4,5,6,7,8.. Next is 64

Square ± 1,2,3,

[x2±1,2,3,4,5], [(x+1)2±1,2,3,4,5], [(x+2)2±1,2,3,4,5]……..

Example : 3, 6, 11, 18, 27, ?

12+2, 22+2, 32+2, 42+2, 52+2, 62+2, = 38

(x2+x), [(x+1)2±(x+1)], [(x+2)2±(x+2)]………

Example : 1, 6, 12, 20, 30, 42, ?

12+1, 22+2, 32+3, 42+4, 52+5, 62+6, 72+7= 56,

Cube ± 1,2,3

Just like square questions bases on cube may be asked.

Ex: 336, 210, 120, 60, 24, ?, 0

73-7, 63-6, 53-5, 43-4, 33-3, 232, 13-1, Answer is 6

Ex: 2, 3, 10, 29, 66, ?

03+2, 13+2, 23+2, 33+2, 43+2, 53+2, = 127

Miscellaneous Questions / विविध प्रश्न

Ex : 181, 191, 202, 206, 214, ?

181+(1+8+1) =191, 191+(1+9+1)=202, 202+(2+0+2)=206, 206+(2+0+6)=214, 214+(2+1+4) = 221

Ex: 6, 15, 35, 77, 143, 221, ?

Multiple of prime numbers

2×3, 3×5, 5×7, 7×11, 11×13, 13×17 = 221

Ex: 9, 27, 31, 155, 161, 1127, ?

9×3=27, 27+4=31, 31×5=155, 155+6=161, 161×7=1127, 1127+8=1135

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