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Question
The value of $$\sum_{r=1}^{10} r.P(r,r)$$ is
A
$$P(11,11)$$
B
$$P(11,11)-1$$
C
$$P(11,11)+1$$
D
$$\left\lfloor 12 \right -1$$
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Solution
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Correct option is A. $$P(11,11)$$
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