Calcule A + B
A=13 + 33 + + ... + 113
B=23 + 43 + 63 + ... + 123
A=13 + 33 + + ... + 113
B=23 + 43 + 63 + ... + 123
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A=13+33+...+113.
113=13+(n-1)20. sn=(13+113)x6
100=(n-1)20. sn=126×3
5=n+1 sn=378
n=6
B=23+43+63+...+123
123=23+(n-1)20. sn=(23+123)×6
100=(n-1)20. sn=146×6
5=n+1. sn=876
n=6
Hallar:a+b=378+876=1254
Respuesta:1254