NOCHILLL
NOCHILLL
20-03-2017
Mathematics
contestada
FIND X
2+6+18+.............+x=531440
Respuesta :
Аноним
Аноним
24-03-2017
a=2; R=3
sum to nth term = a(R^n-1)/(R-1)
so
531440 = 2*(3^n-1)/(3-1)
= 3^n - 1
3^n = 531441
n = 12
x = 2x3^(12-1)=2x3^11
= 354294
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