Question

2. Si: f(N) = 3N+7; calcule “M” M = f (1) + f (2) + f (3) +……. + f(40)

Answer 1

Respuesta:

M = 2740

Explicación paso a paso:

M = 3(1) + 7 + 3 (2) + 7 + 3(3) +7 + ……. + 3(40) +7

M = 3 ( 1+ 2 + 3 + … + 40 ) + 40 (7)

M = 3 (40x41/2)  + 280

M = 3 (20 x 41) + 280

M = 3 (820) + 280

M = 2460 + 280

M = 2740

sumatoria de los números naturales N = n (n + 1)/2