Question

Rewrite each series using sigma notation:

a) 3+9+27+81+243
b) 1+1/2+1/3+1/4+1/5+1/6
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Can anyone please answer this question fast...it's urgent

Answer 1

see attached

Explanation:

See attached workings

a) You should be able to see that this is a series of 3^n.

3 = 3^1 9 = 3^2 27 = 3^3 etc.

b) This is a series of 1/n:

1 = 1/1 1/2 1/3 etc.