O coeficiente de x^2 na expansão (1+x).(1+2x).(1+3x).(1+4x).(1+5x)?

-patricio-patricio
in Science & Mathematics

O coeficiente de x^2 na expansão (1+x).(1+2x).(1+3x).(1+4x).(1+5x) é:

R:85

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