What are the values of r and A sub 1 for this series? the sum from k is equal to 1 to 5 of 3
A
r is equal to 5 ; A sub 1 is equal to 1 thirdB
r is equal to 1 third ; A sub 1 is equal to 3C
r is equal to 5 ; A sub 1 is equal to 5D
r is equal to 1 fifth ; A sub 1 is equal to 3