Question

$<h4>REFER THE ATTACHMENT. </h4>$

Answer 1

11Cr ( a x^2)^ 11-r (1/bx)^r

11Cr a^11-r x^22-2r ( b^ -r) x^-r

11Cr a^11-r b^-r x^22-3r

22-3r = 7.

3r = 15

r= 5

11C5 a^6 b^-5

Answer 2

Answer:

r= 5 please mark me brainliest