# NUMBER SERIES FOR ALL COMPETITIVE EXAM 8 OCTOBER 2016

NUMBER SERIES

1. 11, 11, 13, 31, __, 71

Ans:- 17

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Solution:- Next value is interchange of previous value

2.  1000, 999, 995,­ __, 970, 945

Ans:- 986

Solution:- 1000-1²= 999 , 999-2² = 995,….,995-3²=986

3.  2 , 7, 17 , 34 , __ , 97

Ans:- 60

Solution:- 2 + (2²+1)= 7 , 7 + (3²+1)= 17,…, 34 + (5²+1)= 60

4.  50 , 100 , 100 , 66.6 , __ , 13.25

Ans:- 33.33

Solution:-   50÷.50 = 100 , 100 ÷ (.50+.50) = 100 , 100 ÷ (1+.50) = 66.6

66.6 ÷ (1.50+.50) = 33.3

5.  1 , 2 , __ , 5 , 7 , 11

Ans:- 3

Solution:- In series prime number

6.  1 , 5 , 14 , 30 , __ , 121

Ans:- 85

Solution:- 1+0 =1 , 1 + 2² =5,….,30 + 5² = 85

7.  20 , 10 , 10 , 20 , 40 , __

Ans:- 320

Solution:- 20 × ½ = 10, 10 ×(½+½) = 10,…,40 × (4+4) = 320

8.  1728 , 1000 , __ , 216 , 64 , 8

Ans:- 512

Solution:- 12³, 10³ , 8³….

9.  1 , 4 , 9 , 25 , 49 , __

Ans:- 121

Solution – square of prime number

1² , 2² , 3²,…., 11²

10.  500 , 490 , 470 ,  440 , __ , 350

Ans:- 400

Solution:- 500 –(2×5) = 490, 490- (2×10) = 470,…,440-(2×20) = 400

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