Number Series Questions Asked- IPPB PO 2017

Ques 1) 5, 4, 7, 20, 79, ?
Ques 2)18, 9, 9, 13.5, 27, ?
Ques 3) 3, 83, 152, 209, 253, ?
Ques 4) 318, 160, 82, 44, ?
Ques 5) 500, 500, 493, 467, 404, ?
Ques 6) 22, 11, 11, 16.5, 33, ?
Ques 7) 6, 5, 9, 26, 103, ?
Ques 8) 401, 401, 394, 368, 305, ?
Ques 9) 4, 75, 136, 186, 224, ?
Ques 10)158, 80, 42, 24, ?
Ques 11) 3, 72, 129, 173, 203, ?
Ques 12) 309, 309, 302, 276, 213, ?
Ques 13) 24, 12, 12, 18, 36, ?
Ques 14) 126, 64, 34, 20, ? ,12
Ques 15) 4, 3, 5, 14, 55, ?
1) 
⇒ 5 ✕ 1-1=4
4 ✕ 2-1=7
7 ✕ 3-1=20
20 ✕ 4-1=79
79 ✕ 5-1=394
Ans 394 

2)

⇒ 18 ✕ 0.5 = 9
⇒ 9 ✕ 1 = 9
⇒ 9 ✕ 1.5 = 13.5
⇒ 15.5 ✕ 2= 27
⇒ 27 ✕ 2.5 = 67.5 answers

3 ) 

There is pattern between the differences of the numbers given in the series.
83 - 3 = 80
152 - 83 = 69
209 - 152 = 57
253 -209 = 44

Now
⇒ 80 - 69 = -11
⇒ 69 - 57 = -12
⇒ 57 - 44 = -13
⇒ 44 - 30 = -14

30 is the answers

4 ) 

This questions was very easy, there was a clear pattern in series, no need to find the differences.
⇒ x0.5+1
⇒ x0.5+2
⇒ x0.5+3
⇒ x0.5+4

5 )

Again we need to find the differences between the numbers and then there was a pattern in the differences.
⇒ 0....-7....-26....-63....-124
⇒ 7....19....37....61
⇒12....18....24

6) 

⇒ x0.5....x1....x1.5....x2....x2.5
⇒ 33 ✕ 2.5 = 82.5

7)

⇒ x1-1….x2-1…x3-1….x4-1

8)

There is pattern between the differences of the numbers given in the series.
⇒ 0....-7....-26....-63....-124
⇒ 7....19....37....61
⇒ 12....18....24 

9) 

+71....+61....+50....+38....+25

-10....-11....-12....-13

10 ) 

x0.5+1….x0.5+2….x0.5+3….x0.5+4
 24 ✕ 1/2 + 3=
15 Answer
Read the IPPB PO Exam Analysis here.