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If a1, a1, a2, a3, ....., an, are the ro...

If `a_1, a_1, a_2, a_3, ....., a_n`, are the roots of equation `x^(n+1) - 5x^2 + 6x – 3=0 and (a_1-a_2)(a_1-a_3)(a_1-a_4) ........(a_1 - a_n)=k`, then `n(n +1) a_1^(n-1) - 2k` equals :

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