Question

B=3+3^3+3^5+...+3^49+3^51

Answer 1

\(9B=3^3+3^5+...+3^{53}\)

\(\Leftrightarrow8B=3^{53}-3\)

hay \(B=\dfrac{3^{53}-3}{8}\)

Answer 2

B=353−38