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\\  $\mathbb{V}\delta=\mathbb{V}X_1(\sum_{i=1}^{n}a_i^2 + \sum_{i\neq j}a_ia_j)$\\  \\  $(\sum_{i=1}^{n}a_i^2 + \sum_{i\neq j}a_ia_j)\neq 1$ 1$\\  \\  \\  \\  IA: $m=2$\\  \\  $\sum_{i=1}^{2}a_i^2 + \sum_{i\neq j}a_ia_j = \sum_{i=1}^{2}a_i$\\  \\  $\Leftrightarrow a_1^2+a_2^2+2a_1a_2 = \sum_{i=1}^{2}a_i$\\  \\  $\Leftrightarrow a_1^2+(\sum_{i=1}^{2}a_i-a_1)^2+2a_1(\sum_{i=1}^{2}a_i-a_1) = \sum_{i=1}^{2}a_i$\\