Rewrite each series using sigma notation: a) 3+9+27+81+243
b) 1+1/2+1/3+1/4+1/5+1/6


Can anyone please answer this question fast...it's urgent

see attached

Step-by-step 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.

4444444444444 i think