Question

-20, 10, -5,

I need the next sequence

Answer 1

• The next term in the sequence is 5/2 or 2.5.

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Given series:

• -20, 10, - 5, ...

We notice that this is a geometric progression.

The common ratio is:

• r = -5/10 = 10/ -20
• r = - 1/2

To find the next term multiply the last term by the common ratio:

• 
  `t_n=rt_(n-1)`

The 4th term is:

• 
  `t_4=(-1/2)*(-5)=5/2=2.5`