3. The graph of ƒ(x) = 8 – x³ and line l which is tangent to f(x) at x = 1 is shown in the figure to the right. The equation for line l is y = -3x + 10. Region R is the shaded region between line l, the graph of f (x) and the y-axis while S is the shaded region between line l, the graph of f (x) and the x-axis. R (1,7) line / y=8-x (a) Find the area of the shaded region R. S (b) Region R is the base of a solid. For this solid, each cross section perpendicular to the x-axis is a semi-circle. Write, BUT DO NOT EVALUATE, an integral expression that would compute the volume of the solid. (c) Region S is rotated about the y-axis. Write, BUT DO NOT EVALUATE, an integral expression that would compute the volume of the solid.
Permutations and Combinations
If there are 5 dishes, they can be relished in any order at a time. In permutation, it should be in a particular order. In combination, the order does not matter. Take 3 letters a, b, and c. The possible ways of pairing any two letters are ab, bc, ac, ba, cb and ca. It is in a particular order. So, this can be called the permutation of a, b, and c. But if the order does not matter then ab is the same as ba. Similarly, bc is the same as cb and ac is the same as ca. Here the list has ab, bc, and ac alone. This can be called the combination of a, b, and c.
Counting Theory
The fundamental counting principle is a rule that is used to count the total number of possible outcomes in a given situation.
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