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S=1+3+3¹+3²+3³+3⁴+3⁵+·······+3²⁰⁰², CAT ESTE S

Răspuns :

1 + 3 + 3² + 3³ + ...... 3²⁰⁰² = (3²⁰⁰³ - 1) / 2

Formula generala:

1 + k + k¹ + k² + k³ + ..... k la n = (k la (n+1) -1)/(k-1)