To calculate combinations, we will use the formula nCr = n! / r! * (n - r)!, where n represents the number of items, and r represents the number of items being chosen at a time. To find the probability of an event, you may have to find the combinations.
Answer: sin(-)=perpendicular/hypotenuse Sin(-)=AB/BC Because AB is the perpendicular with reference to angle (-) and BC the hypotenuse since the right angle is facing towards it.Then, Sin(-)=4/5