if x follow b(n, p) find
(i) cov(x/n, (n-x/n)
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Date: 21st April 2020, Train Name: Howrah-New Delhi Poorva Express, Cause: Derailment, Casualties: 13 people got injured, Place: Rooma in Maharajpur, 12km from Kanpur, Deflected Coaches: 8, S9, B1-B5, A1, A2, HA1, pantry car, and an SLR (luggage bogie)
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