NUMBER SERIES FOR ALL COMPETITIVE EXAM 8 OCTOBER 2016
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NUMBER SERIES
1. 11, 11, 13, 31, __, 71
Ans:- 17
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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