Write down in full the sum of each of the following series , and hence find its value .
(1)
(2)
(3)
My thought process :
(1)
=6 ---- my ans is wrong .
I have no idea how to do the rest .
Of course your answer is wrong. . eg. should be obvious.
Just write each sum out in full and then add up using basic arithmetic.
There is certainly no formula for the sum of reciprocals. The fact that there are only a few terms in each of your sums should be the clue that you write the sum out in full and then calculate.