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Statement-1 (Assertion) and Statement-2 (Reason) Each of these questions also has four alternative choices,
\( \mathrm{P} \) only one of which is the correct answer. You have to select

W the correct choice as given below.
(a) Statement-1 is true, Statement-2 is true; Statement-2 is a correct explanation for Statement-1
(b) Statement-1 is true, Statement-2 is true; Statement-2 is not a correct explanation for Statement-1
(c) Statement1 is true, Statement-2 is false
(d) Statement-1 is false, Statement-2 is true
Statement 1 The sum of the products of numbers \( \pm a_{1}, \pm a_{2}, \pm a_{3}, \ldots, \pm a_{n} \) taken two at a time is \( -\sum_{i=1}^{n} a_{i}^{2} \).
Statement 2 The sum of products of numbers \( a_{1}, a_{2}, a_{3} \), \( \ldots, a_{n} \) taken two at a time is denoted by \( \sum_{1 \leq ij \leq n} \sum a_{i} a_{j} \).
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