21. 46080, 3840, 384, 48, 24, 2, 1 ?

1. 1. 1

   
   
   

   2. 2

   
   
   

   3. 24

   
   
   

   4. 384

   
   
   

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1. View Hint View Answer Discuss in Forum

   The terms are successively divided by 12, 10, 8, 6 .... etc. So, 24 is wrong.

   Correct Option: C

   The terms are successively divided by 12, 10, 8, 6 .... etc. So, 24 is wrong.

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22. 6, 13, 18, 25, 30, 37, 40 ?

1. 1. 25

   
   
   

   2. 30

   
   
   

   3. 37

   
   
   

   4. 40

   
   
   

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1. View Hint View Answer Discuss in Forum

   The difference between two successive terms from the beginning are 7, 5, 7, 5, 7, 5.
   

   Correct Option: D

   The difference between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.
   

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23. 56, 72, 90, 110, 132, 150 ?

1. 1. 72

   
   
   

   2. 110

   
   
   

   3. 132

   
   
   

   4. 150

   
   
   

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1. View Hint View Answer Discuss in Forum

   The number are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13 .

   Correct Option: D

   The number are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13 . So, 150 is wrong.

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24. 25, 36, 49, 81, 121, 169, 225 ?

1. 1. 36

   
   
   

   2. 49

   
   
   

   3. 121

   
   
   

   4. 169

   
   
   

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1. View Hint View Answer Discuss in Forum

   The number are square of odd natural numbers, starting from 5 up to 15.

   Correct Option: A

   The number are square of odd natural numbers, starting from 5 up to 15. So, 36 is wrong.

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25. 1, 2, 6, 15, 31, 56, 91 ?

1. 1. 31

   
   
   

   2. 91

   
   
   

   3. 56

   
   
   

   4. 15

   
   
   

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1. View Hint View Answer Discuss in Forum

   Add 1², 2², 3², 4², 5², 6² .

   Correct Option: B

   Add 1², 2², 3², 4², 5²,6² .
   So, 91 is wrong.

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