Respuestas

2012-06-12T03:37:32+02:00

tn=t1+(n-1)d                    sn=(t1+tn)n/2

36=8+(5-1)d

36-8=4d

d= 28/4

d=7

 

t10= 8+(10-1)7

t10= 8+63

t10=71

 

s10= (8+71)(10)/2

s10= 395