NUMBER SERIES OF MATH FOR ALL COMPETITIVE EXAM, 10TH OCT0BER 2016

NUMBER SERIES

1.  97 , 89 , 83 , ? , 73

     Ans:- 79

     Solution:- series of prime number

2.  2 , 4 , 8 , 16 , ?

     Ans:- 32

     Solution:- 2 + 2 = 4, 4 + 4 = 8…16 + 16 =32

3.  3125 , 625 , ? , 25 , 5

     Ans:- 125

     Solution:- 5⁵ = 3125, 5⁴= 625..5³= 125

4.  3125 , ? , 27 , 4 , 1

     Ans:- 256

     Solution:-  5⁵ = 3125 , 4⁴ = 256, 3³ = 27

5.  4 , 12 , 28 , 60 , ?

     Ans:- 124

     Solution:-  4 + 2³ = 12 , 12 + 2⁴ = 28,…,60 + 2⁶ = 124

6.  1000 , 500 ,125 , ? , 31.25

      Ans:- 62.5

      Solution:-  1000 ÷ ½ = 500,500 ÷ ½ = 125,…, 125 ÷ ½ = 62.5

7.  999 , 874 , 810 , 783 , ?

     Ans:- 725

     Solution:- 999 – 5³ = 874 , 874 – 4³ = 810,…, 783 – 2³ = 775

8.  10 , 15 , 25 , ? , 68

     Ans:- 42

     Solution:- 10 + (2² + 1) = 15, 15 + (3² + 1) = 25,..,25 + (4² + 1) = 42

9.  101 , ? , 145 , 170 , 197

     Ans:- 122

     Solution:- 10² + 1 = 101 , 11² + 1 = 122

10. 50 , 250 , 350 , ? , 425

      Ans:- 400

    Solution:- 50 + 200 = 250 , 250 + 100 = 350 , 350 + 50 = 400 , 400 + 25 = 425

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