Answer / alok patil

18-8=10
10/4=2.5
1st circle dia= 8
2nd circle dia= 8+2.5= 10.5
3rd circle dia= 8+ 2.5+ 2.5= 13
4th circle dia= 8+ 2.5+ 2.5+ 2.5= 15.5
5th circle dia= 8+ 2.5+ 2.5+ 2.5+ 2.5= 18

mid circle dia ( 3rd one)= 13

Answer / rahul wagh

Consider The Que in A.P. and solve An=A+(n-1)*d
An=18, A=8, n=5, So d=2.5 So A3=13

Answer / subbu

Depends on the type of progression that the diameters increase- AP, GP, Exp........

If they are in an AP, the answer is 13.
If they are in a GP, the answer is 12.

Answer / naveen

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