It's an arithmetic sequence so terms must have a common difference
What is the first term and the common difference in this sequence?
How can you use them in the sum of a series formulae? you look to be using the version of the formula that combines the first and last term. In which case what is the value of the
'r'th term - it isn't r! Alternatively, use the other formula where n=r.
Posted from TSR Mobile
What is the first term and the common difference in this sequence?
How can you use them in the sum of a series formulae? you look to be using the version of the formula that combines the first and last term. In which case what is the value of the
'r'th term - it isn't r! Alternatively, use the other formula where n=r.
Posted from TSR Mobile
(edited 9 years ago)
Original post by bl64
Find the sum of the arithmetic series to the term indicated
p+3p .... ; rth term
I did r/2 (p+r) but that gave pr and not pr^2 which is the answer in the book, could someone explain how to do it
p+3p .... ; rth term
I did r/2 (p+r) but that gave pr and not pr^2 which is the answer in the book, could someone explain how to do it
The difference is 2p here
THe rth term is
The first term is
THe number of elements is: r
From these you can write down the sum according to the formula
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