A series of *** 10 items (the number of items), each item is three times that of the previous item (that is, the common ratio =3), and the first item is 1.

According to the summation formula of equal proportion sequence

Sum =[ the first term ×( 1- the common ratio of the power of this term) ]/( 1- the common ratio)

Calculate the total as 29,524 (gross)

The problem of geometric series is a sophomore, maybe you haven't learned it yet.