The value of -50-r-0-100C-r-200C-150-r- is equal to

The correct option is A ^100C_r.^200C_150+r=^100C_r.^100C_50 r Thus, ∑^50_r=0^100C_4.^200C_50 r=^300C_50 ...

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Coefficients of Terms Equidistant from Beginning and End

The value of ...

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The value of $\sum^{50}_{r=0}(^{100}C_r.^{200}C_{150+r})$ is equal to

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