Question

100
∑ 3(5)^ k-1 represents ?
k =1

Answer 1

an arithmatic series with a=5; d= 3
an arithmatic series with a=3; d= 5
a geometric series with a = 3; r = 5
a geometric series with a = 5; t = 3

Answer 2

look at the terms k = 1 gives 3
k = 2 gives 15
k = 3 gives 75
k = 4 gives 375

this is a gometric series with a common ratio of 5... each term is 5 times the previous and 1st term of 3