Sigma notation / Geometric sequence

2007-05-17 6:54 pm

Plz help me!

If 2, -4, 8 , -16 , 32 , -64 , 128 are the given geometric sequence, then how can i put it in Sigma notation? This is urgent!

回答 (1)

2007-05-17 9:55 pm

✔ 最佳答案

sigma -(-2^i) [i = 1 to n]

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