IPPB PO - Number Series Questions asked on 8-1-2017

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, ?

1) 
⇒ 2^0 - 0 = 1
⇒ 2^2 - 1 = 3
⇒ 2^4 - 3 =13
⇒ 2^8 - 5= 59
⇒ 2^10 - 7 = 1017

Answer is 1017 + 79 = 1096

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

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