The Average length of any 4 fingers of my left hand is 600 mm . Then the average length of all the five fingers of my left hand is :

a) 800mm
b) 850mm
c) 750mmd) cant be determined

No of ways five fingers can be arranged is 5C4=5
Average of finger(1,2,3,4)=600
". ". (2,3,4,5)=600
". ". (2,4,5,1)=600
". ". (4,5,1,2)=600
". ". (5,1,2,3)=600
Add them all
Average of 4(1,2,3,4,5)= 3000
Average of (1,2,3,4,5)= 3000/4=750

yeah .. i was wondering the same .. its a question from quantum cat .. they have given 750 as the answer but i couldnt understand the logic and explaination mentioned there

I got 600 (any 4 fingers -randomly selecting it out of 5-that means length of each finger is same and is equal to 600 mm)

I'm getting the answer as 600mm. Are you sure of the options?

Thanks

Thanks

The answer is 600 mm.

600 mm per finger. That's the only logic conclusion if **any 4 fingers average length is 600 mm **.
So average of five fingers would also be 600 mm in this case.

I guess they meant sum of any four fingers length is 600 mm and not average.
This would lead to the solution of each finger being 150 mm length.

They also wanted sum of all five fingers.
150 mm * 5 =750 mm.

750