Question

Геометрическая прогрессия

Answer 1

$s6 = frac{b1( {q}^{ 6} - 1)}{q - 1} = frac{6( {5}^{6} - 1) }{5 - 1} = frac{6(15625 - 1)}{4} = frac{6 times 15624}{4} = 6 times 3906 = 23436$