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1,3,-1,-3,-7,-21,-25 how to complete the number seres?
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1,3,-1,-3,-7,-21,-25 how to complete the number seres?
Completing the Number Series


The given number series is:


  • 1

  • 3

  • -1

  • -3

  • -7

  • -21

  • -25



Identifying the Pattern


To complete the number series, we need to identify the pattern in the given series. Here, we can observe that:


  • The first term is 1.

  • The second term is obtained by adding 2 to the first term.

  • The third term is obtained by subtracting 4 from the second term.

  • The fourth term is obtained by subtracting 2 from the third term.

  • The fifth term is obtained by subtracting 4 from the fourth term.

  • The sixth term is obtained by multiplying the fifth term by 3.

  • The seventh term is obtained by subtracting 4 from the sixth term.



Completing the Series


Using the above pattern, we can find the next terms of the series as follows:


  • The eighth term is obtained by subtracting 2 from the seventh term, which is -22.

  • The ninth term is obtained by multiplying the eighth term by 3, which is -66.

  • The tenth term is obtained by subtracting 4 from the ninth term, which is -70.



Therefore, the completed number series is:


  • 1

  • 3

  • -1

  • -3

  • -7

  • -21

  • -25

  • -22

  • -66

  • -70

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1,3,-1,-3,-7,-21,-25 how to complete the number seres?
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