Question

please please give answer urgently of f number​

Answer 1

(16/5)^-5 X (4/25)^5

=(5/16)⁵ X (4/25)⁵

=5/16 X 5/16 X 5/16 X 5/16 X 5/16 X 4/25 X 4/25 X 4/25 X 4/25 X 4/25

=1/4 X 1/4 X 1/4 X 1/4 X 1/4 X 1/5 X 1/5 X 1/5 X 1/5 X 1/5

=(1/4)⁵X(1/5)⁵

=(1/4X1/5)⁵ a⁵ X b⁵ = (ab)⁵

= (1/20)⁵