Texas Instruments TI-80 User Manual - Page 50
Getting Started: Lottery Chances - buy
View all Texas Instruments TI-80 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 50 highlights
Getting Started: Lottery Chances Getting Started is a fast-paced introduction. Read the chapter for details. Suppose you want to enter a lottery where six numbers will be drawn out of 50. To win, you must pick all six numbers (in any order). What is the probability of winning if you buy one ticket? What is the probability of winning if you buy five tickets? 1. Determine the number of combinations possible. On the Home screen, press 50 to enter the total number of items. Press I 6 to display the MATH PRB menu. Press 3 to select nCr. Press 6 to enter the number of items selected. 2. Press ¸ to evaluate the expression. This is the total number of possible combinations of 6 numbers drawn from a set of 50 numbers. With one ticket, you have one chance in 15,890,700 of winning. 3. To calculate the probability of winning with one ticket, press 1 e 2 ± ¸. The answer is too large to display in fixed notation; therefore, it is shown in scientific notation. 0.00000006292988981 is the decimal equivalent. 4. To calculate the probability of winning with five tickets, press p 5 ¸. Again, the answer is too small to display in fixed notation. The decimal equivalent is 0.000000314649449. 2-2 Math, Angle, and Test Operations