4. If ak is a nonnegative sequence and E,ak converges then 2k=1@ki aki subsequence of a. 5. If Eak is convergent then (a1 + a2) + (a3 + a4) + (a5 + a6) ...+ (a2n-1+ a2n) + ...= E1(a2k-1 + a2k) is convergent.

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