Answer:
11919
Step-by-step explanation:
S base n = n over 2 [ a + ℓ] is the sysbol of sum of arithmetic progression
S = sum, a = the fist term, ℓ = the last term, n = the term that you want to find
Now :
S base n = n over 2 [a+ℓ]
S base 58 = 58 over 2 [ 6+405]
= 29 ( 411)
= 11919
