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• 1x2+2x3 + 3x4+ 4x5 + ....... + n(n+1) = n(n+1)(n+2)/3
Entonces:
Para: S = 1x2+2x3+3x4......+24x25 , tendremos que n=24, reemplazando:
S = 24(24+1)(24+2)/3
S = 24(25)(26)/3 = 8*25*26
S = 5200
Eso es todo! Saludos! Jeizon1L