wiz-icon
MyQuestionIcon
MyQuestionIcon
22
You visited us 22 times! Enjoying our articles? Unlock Full Access!
Question

The sum 1 20C12 20C2+3 20C320 20C20 is equal to

Open in App
Solution

Using rnCr=n n1Cr1
20r=1(1)r1r 20Cr=20r=1(1)r120 19Cr1
=20(19C0 19C1+ 19C2 19C19)
=20×0=0

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Sum of Coefficients of All Terms
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon