Question

If film l-m) = Im then the arithmetic mean off (l, m) and f (m. 1) is​

Answer 1

Answer:

Correct option is

B

4 lm

2

n

Given m is the Arithmetic mean between l and n

⇒m=

2

l+n

...(1)

And Given G

1

,G

2

,G

3

are Geometric mean between l and n

∴G

1

=l

3/4

n

1/4

G

2

=l

1/2

n

1/2

and G

3

=l

1/4

n

3/4

Hence, G

1

4

+2G

2

4

+G

3

4

=l

3

n+2l

2

n

2

+ln

3

=ln(l+n)

2

=4lm

2

n