Question

Find the sum :
3^(1)+3^(2)+3^(3)+3^(4)+3^(5)...........+3^(60))

Answer 1

$3(1 + 2 + 3 + ........ + 60) \\ 3(60 \times 61 \div 2) \\ 3 \times 30 \times 61 \\ 5490$