MACM 101 Lecture 7: Lecture 7
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13 Aug 2016
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Monty hall offers you a choice of 3 doors. One contains a prize, but the other two contain nothing. After choosing your door, monty reveals a door which does not contain the prize and then offers to let you switch doors. Solution: the probability you selected the correct door initially is 1/3 so p(wrong door) = 2/3. Case a (1 in 3): the prize is behind door #1. in this case, you do best to keep the door. Case b (2 in 3): the prize is not behind door #1. the best strategy is to switch doors. Definition: a proposition is a statement that is either true or false, but not both. The truth value is one of true or false, which is denoted by 1 or 0 in grimaldi and perhaps t or f in other texts. Give examples of statements which are not propositions. Come here! x + y = 15 [predicate]
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No common factor m^5 (20m^4 + 6m^2 +20) 2m^5 (10m^4 + 3m^2 +10) |
(0, 0) (0, 1) (1, 1) |
121p^2 + 88p - 16 121p^2 - 16 121p^2 - 88p -16 |
(7, -7) (9, -9) (-7, 7) |
(18x^2 - 2)(x - 5) (3x^2 - 2)(6x - 5) x(18x + 2)(x +5) |
x^2 + 8xy + 8y^2 x^2 + 8xy + 15y^2 x + 8xy + 15y |
54x^14 + 72x^9 54x^14 + 72x^9 -42x^7 54x^14 + 12x^2 -7 |
(15x - 2)(x + 4) (3x - 2)(5x + 4) (3x + 2)(5x -4) |
Trinomial, degree 3 Trinomial, degree18 Trinomial, degree11 |
12x^42 + 9 10x^26 - 2x^14 + 4x^12 +9 4x^8 + 4x^7 + 4x^6 +9 |
-3n^5 + 11n^3 - 3 5n^8 -3n^5 + 11n^3 -9 |
(-2, 4) (-1, 3) No solution |
(4, 1) (4, 0) No solution |
False |
False |
False |
False |
False |
False |
False |