Respuesta :

apologiabiology
k, so, lets add them up
1+2=3
1+2+3=6
1+2+3+4=10
1+2+3+4+5=15
1+2+3+4+5+6=21
1+2+3+4+5+6+7=28
etc

basically
all numbers 'x' such that
x=[tex] \frac{(n+1)(n+2)}{2} [/tex] and n is the set of all natural numbers


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