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If a = 18, b=24, c= 30 and if l = r2- r...

If a = 18, b=24, c= 30 and if `l = r_2- r_1 , m = r_3 - r_2 , n= r_3 - r_1 ` then descending order of l , m, n is

A

n,m,l

B

l,m,n

C

l,n,m

D

n,l,m

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