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There were over 350,000,000 sold before Apple stopped releasing sales information in 2015.
All the lines meet at one point: a single solution. All the lines are the same: infinitely many solutions. At least one of the lines does not pass through the point of intersection of the others: no solution.
P(X|Y) = P(Y intersection X) / P(Y); where P(X|Y) is probability of event X provided event Y had already occurred P(Y) is probability of event Y happening P(Y intersection X) is probability of events Y & X occurring together Q3.a P(Y): Prob of at least one insurance schemes (A or B) has been sold = 1 - Prob of none of the schemes sold = 1 - (1-Prob of A being Sold)*(1-Prob of B being Sold) // As schemes A & B are independent = 1 - (1-0.6)(1-0.4) = 1 - (0.4)*(0.6) = 1 - 0.24 = 0.76 P(X intersection Y): Prob of at least one insurance schemes (A or B) has been sold AND also scheme 'A' being sold = Prob(A sold) and Prob (B sold) + Prob(A sold) and Prob (B not sold) = 0.6 * 0.4 + 0.6 * (1-0.4) = 0.24 + 0.36 = 0.6 P(X|Y): Prob scheme A has been sold given that at least one insurance scheme has been sold = P(X intersection Y) / P(Y) = 0.6 / 0.76 = 15/19
Traditionally, least to greatest.
' 1 ' is the least positive integer.There's no least negative integer.