Ratio of area of two circles = (Ratio of radius)2 = 4:25 Ratio of Circumference = Ratio of radius Hence, Ratio of Circumference = √(4/25) = 2:5
In each of the following giving number series, a wrong number is given. Find out the wrong number?
82, 81, 86, 110, 168, 287
2, 4, 12, 20, 30, 42
14, 16, 22, 46, 172, 886
12, 28, 64, 128, 228, 379
225, 45, 450, 90, 900, 150, 1800
132, 144, 162, 186, 216, 255, 294
12, 29, 64, 151, 322, 669
31, 39, 49, 73, 121, 217
120, 125, 140, 165, 210, 245
63, 124, 215, 345, 511, 728
