If -i-1nai-0 where -ai-1 for all i then the value of -1- i-j- n-aiaj is

The correct option is B n2 ∑_i=1^na_i=0 (∑_i=1^na_i).(∑_i=1^na_i)=∑_i=1^n|a_i|^2+2∑_1≤ i lt;j≤ n^n∑a_i.a_j ∑_1≤ i lt;j≤ n∑a_i.a_j= n2 ...

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Middle Terms

If ∑i=1nai=...

Question

If $\sum_{i = 1}^{n}_{i} = 0$ where $∣ ∣_{i} ∣ ∣ = 1$ for all $i$ then the value of $\sum_{1 \leq i < j \leq n} \sum_{i}_{j}$ is

\frac{- n}{2}

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\frac{n}{2}

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n

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Similar questions

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