In question 18, write the value of a 11 C 21 + a 12 C 22 + a 13 C 23 .

Question

Philoid · Accepted Answer

We have to find out the value of a₁₁×C₂₁+a₁₂×C₂₂+a₁₃×C₂₃

LetI=a₁₁×C₂₁+a₁₂×C₂₂+a₁₃×C₂₃

I= a₁₁×-(a₁₂a₃₃-a₁₃a₃₂)+a₁₂×(a₁₁a₃₃-a₁₃a₃₁)+a₁₃×-(a₁₁a₃₂-a₁₂a₃₁)

I=-a₁₁a₁₂a₃₃+a₁₁a₁₃a₃₂+a₁₁a₁₂a₃₃-a₁₂a₁₃a₃₁-a₁₁a₁₃a₃₂+a₁₂a₁₃a₃₁

I= a₁₁a₁₂a₃₃–a₁₁a₁₂a₃₃+a₁₁a₁₃a₃₂-a₁₁a₁₃a₃₂+ a₁₂a₁₃a₃₁- a₁₂a₁₃a₃₁

I=0

In question 18, write the value of a11C21 + a12C22 + a13C23.