Explicación paso a paso:
A) 1/2 × 2/3 × 3/4 × (1-1/n)
1/4 × (1-1/n)
1/4-1/4n
n-1/4n
B)1/2 + 1/6 + 1/12 + 1/(n-1)
3/4 + 1/(n-1)n
3n×(n-1)+4/4n×(n-1)
3n^2-3n+4/4n^2-4n
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Explicación paso a paso:
A) 1/2 × 2/3 × 3/4 × (1-1/n)
1/4 × (1-1/n)
1/4-1/4n
n-1/4n
B)1/2 + 1/6 + 1/12 + 1/(n-1)
3/4 + 1/(n-1)n
3n×(n-1)+4/4n×(n-1)
3n^2-3n+4/4n^2-4n