1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

# In a circular dartboard of radius 20 cm, there are 5 concentric circles. the radius of each inner concentric circle is 4 cm less than the outer concentric circle. Find the probability that a dart hits anywhere in the smallest circle assuming that the dart doesn't hit on the boundary of any circle.

A

15

No worries! We‘ve got your back. Try BYJU‘S free classes today!
B

125

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C

1π

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

0

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

## The correct option is B 125 Difference in radius between 2 circles = 4cm Let, radius of small circle be x. ⇒ x + 4 + 4 + 4 + 4 = 20 (from the diagram) ⇒x = 4cm Probability that the dart hits anywhere in the small circle = area(innermost circle)area(outermost circle) =π.42π202 =125

Suggest Corrections
0
Join BYJU'S Learning Program
Related Videos
Geometric Probability
MATHEMATICS
Watch in App
Explore more
Join BYJU'S Learning Program