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a₁+a₂+a₃+.....+a₉
______________ = 25
9
a₁+a₂+a₃+...+a₉=225
Grupo 2
a₁+a₂+a₃+.....a₁₁
______________ = 45
11
a₁+a₂+a₃+.....+a₁₁= 495
Ahora:
Grupo₁+Grupo₂ 225 + 495 720
______________ ⇒ ____________ ⇒ _______ ⇒ 36
20 20 20
Rpta: 36