\(\sum_{k=0}^{r}{}^{m+k}C_k={}^{m+r+1}C_r\) को पहचानने का सबसे अच्छा तरीका क्या है?
What is the best way to recognize \(\sum_{k=0}^{r}{}^{m+k}C_k={}^{m+r+1}C_r\)?
Explanation opens after your attempt
B. इसे hockey-stick identity का shifted रूप माननाTreat it as a shifted form of the hockey-stick identity
Simple Explanation
Upper और lower indices साथ बढ़ रहे हैं इसलिए यह diagonal sum है। परीक्षा में diagonal combination sum दिखे तो hockey-stick सोचें। / The upper and lower indices increase together so it is a diagonal sum. In exams think of hockey-stick when a diagonal combination sum appears.
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