Let ′a′ be the variance of the first 25 natural numbers. If a foca – InterviewSolution

1.	Let ′a′ be the variance of the first 25 natural numbers. If a focal chord of y2=4ax makes an angle α∈(0,π4] with the positive direction of x axis, then the minimum length of the focal chord is
Answer» Let $^{'} a^{'}$ be the variance of the first $25$ natural numbers. If a focal chord of $y^{2} = 4 a x$ makes an angle $α \in (0, \frac{π}{4}]$ with the positive direction of $x$ axis, then the minimum length of the focal chord is

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