Find the missing number in the given series

1) 

a) 91     b) 85    c) 80    d) 90

 2) 

a) 43     b) 61    c) 81    d) 31

3) 

a) 91     b) 85    c) 57    d) 90

4) 

a) 91     b) 85    c) 57    d) 70

5) 

a) 92     b) 22    c) 60    d) 42

6) 

a) 53     b) 85    c) 71    d) 97

7) 

a) 53     b) 71    c) 85    d) 97

8) 

a) 81     b) 85    c) 71    d) 87

9) 

a) 53     b) 73    c) 71    d) 97

10) 

a) 53     b) 48    c) 58    d) 56

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Answers with a small hint:-

1) a) Hint:- There is difference of 5 between two successive numbers. This is a descending order series.

2) b) Hint:- There is difference of 7 between two successive numbers. This is a descending order series.

3) c) Hint:- There is difference of 9 between two successive numbers. This is a descending order series.

4) d) Hint:- There is difference of 7 between two successive numbers. This is a descending order series.

5) d) Hint:- There is difference of 4 between two successive numbers. This is a descending order series.

6) c) Hint:- There is difference of 6 between two successive numbers. This is a descending order series.

7) b) Hint:- There is difference of 3 between two successive numbers. This is a descending order series.

8) a) Hint:- There is difference of 8 between two successive numbers. This is a descending order series.

9) b) Hint:- There is difference of 9 between two successive numbers. This is a descending order series.

10) c) Hint:- There is difference of 6 between two successive numbers. This is a descending order series.