1.

For 1≤r≤n , the value of \( {}^nC_r + {}^{n-1}C_r+ {}^{n-2}C_r.....+...+....+ {}^rC_r \space is : \)

Answer»

For 1rn , the value of \( {}^nC_r + {}^{n-1}C_r+ {}^{n-2}C_r.....+...+....+ {}^rC_r \space is : \)




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