[" (99) If "S(n)=sum(k=1)^(n)a(k)" and "...

[" (99) If "S_(n)=sum_(k=1)^(n)a_(k)" and "lim_(n rarr oo)a_(n)=a," then "lim_(n rarr oo)(S_(n+1)-S_(n))/(sqrt(sum_(k=1)^(n)k))" is equal to "],[[" (b) "a," (b) "a],[" (c) "sqrt(2)a," (d) "2a]]

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