7. A bike lock has a combination that consists of 3 digits 0 through 9 followed

Question

7. A bike lock has a combination that consists of 3 digits 0 through 9 followed by a letter A, B, C, D, E, or F How many combinations are possible? a. 4,320 4704-245- b. 4,374 c. 6,000 20 lo-720-.7- 12 34.5- d. 3,024 720 Which of the following expressions will count the ways that 5 bands could be chosen from 7 bands that auditioned to perform in a concert? a. 8. C. d. You roll a die. If it is an even number you win $25, if it is an odd number you get to roll again. If your second roll is even you win $5, if it is odd, you lose. Find the expected amount you'll win a. $15 b. $31.25 C. $8.25 d. $13.75

Explanation / Answer

7)

The first letter of LOCK can be either A or B or C or D or E or F i.e. 6 possible letters.
Second,Third and Fourth letter can be any digit from 0 to 9.

Hence the total number of possible combinations are 6*10*10*10=6000.

Option 'C' is correct.

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