Question:
If 189C35 + 189Cr = 190Cr, then r = ____________.
Solution:
Given :- 189C35 + 189Cr = 190Cr
Using nCr + nCr+1 = n+1Cr+1
⇒ n = 89 and r = 36
Click here to get exam-ready with eSaral
For making your preparation journey smoother of JEE, NEET and Class 8 to 10, grab our app now.