Original post by nathanking
what is
n
∑ (2r+3^r)?
r=1
I struggled to find the sum of 3^r
n
∑ (2r+3^r)?
r=1
I struggled to find the sum of 3^r
Think 'geometric series'.
Original post by TeeEm
too late
I don't think I know this rule ...
Original post by nathanking
I don't think I know this rule ...
I see ...
Original post by TeeEm
I see ...
can you tell me how to do it please?
Original post by nathanking
can you tell me how to do it please?
split the sum into 2
consider each sum separately
fist sum is an Arithmetic series
second sum is a geometric series
etc
Original post by nathanking
what is
n
∑ (2r+3^r)?
r=1
I struggled to find the sum of 3^r
n
∑ (2r+3^r)?
r=1
I struggled to find the sum of 3^r
Quick Reply
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