Cuántas esferas hay en la figura 25?. a) 325 b) 136 c) 120 d) 650 e) 240
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Respuesta:
Espero te sirva
Explicación paso a paso:
1+2= 3
1+2+3=6
1+2+3+4=10
Formula
n(n+1)/2
25(25+1)/2
25.26/2
650/2
325