Question

Calcular el valor de x en:
(x+1)+(x+2)+(x+3)+. . .+(x+31)=31²
a.15
b.14
c.13
d.16
e.17

Answer 1

Explicación paso a paso:

31x + 31(32)/2 = 31²

31x + 31(16) = 31²

31(x+16) = 31²

x + 16 = 31

x = 15