Consider the function $$B(M) = LM-I\cdot\sum_{x=n+1}^{M}{ M \choose x}p^x(1-p)^{M-x}(x-n)$$
What is the first derivative of $B(M)$?
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What have you tried? – Harnak Feb 02 '19 at 12:18
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Here the binomial coefficient is differentiated. Have a look and give a reply. – callculus42 Feb 02 '19 at 12:33