If _ a-n ^ n e^ x(a-x) ,dx= then the value of _ a-n ^ n x ,e^ x(a-x) ,dx, a 2n, is

JEE Advanced Mathematics question

If then the value of , is

Answer: (A)

Use with . Under the factor is unchanged and becomes :

I=(a- dx=aλ-I\

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Question ID VK-109934