Q15Short answer
If nCr – 1 = 36, nCr = 84 and nCr + 1 = 126, then find rC2. n n Cr Cr [Hint: Form equation using n and n to find the value of r.] C r +1 Cr –1
If nCr – 1 = 36, nCr = 84 and nCr + 1 = 126, then find rC2. n n Cr Cr [Hint: Form equation using n and n to find the value of r.] C r +1 Cr –1