Explanation: 
Another Explanation (5):
bài1: 15C11 + 15C10 এর মান নির্ণয়:
আমরা জানি, nCr + nCr-1 = n+1Cr
এখানে, n = 15 এবং r = 11
সুতরাং, 15C11 + 15C10 = 15+1C11 = 16C11
এখন, 16C11 = \(\frac{16!}{11!(16-11)!}\) = \(\frac{16!}{11!5!}\)
= \(\frac{16 \times 15 \times 14 \times 13 \times 12}{5 \times 4 \times 3 \times 2 \times 1}\) 😮
= \(\frac{16 \times 15 \times 14 \times 13 \times 12}{120}\) 🤔
= 16 x 3 x 7 x 13 x 12 / 24 🤓
= 4368 🤩
অতএব, 15C11 + 15C10 = 4368 😎
