If a1, a2, a3, - - - - - - , an be real numbers then which of the following is true?
(use Tchebychef's inequality)
1. \((a_1+a_2+a----+a_n)^2> (n-1)(a_1^2+a^2_2+----+a_n^2)\)
2. \((a_1+a_2+----+a_n)^2\le (n-1)(a_1^2+a^2_2+----+a_n^2)\)
3. \((a_1+a_2+----+a_n)^2\le n(a_1^2+a^2_2+----+a_n^2)\)
4. \((a_1+a_2+a_3----+a_n)^2> n(a_1^2+a^2_2+----+a_n^2)\)
1
1
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2
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3
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4