Q.

The sum of the series S=20C0−20C1+20C2−20C3+…+20C10 is

see full answer

High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET

🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.
An Intiative by Sri Chaitanya

a

− 20C10

b

12 20C10

c

0

d

20C10

answer is B.

(Unlock A.I Detailed Solution for FREE)

Detailed Solution

Using  nCr=nCn−r, we can write 2S=20C0−20C1+20C2−20C3+…20C10+20C20−20C19+          20C18−…+20C10⇒ S=0+12 20C10=12 20C10
Watch 3-min video & get full concept clarity
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

whats app icon
The sum of the series S=20C0−20C1+20C2−20C3+…+20C10 is