1.

Let there be n circles no three of which have collinear centres. If the total number of radical axes is equal to total number of possible radical centres, then possible value of n is

Answer» ` ^n C_2 = ^n C_3 `
`(n(n-1))/2=(n(n-1)(n-2))/(3xx2)`
`n=5`
answer`(3)`


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