25 POINTS!! Why is the compound probability (A*B) twice as big if the two events don't have to happen in any specific order?
Example: The probability of getting A from one draw and B from the second is A*B. But the probability of getting A from a draw and B from another in any order is (A*B)+(B*A). I don't understand why this is at all.

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?