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- Prove or disprove that AB=AC implies B=C.How would you write a formal proof for if AnB = B then B is a subset of A?Suppose that in a particular Finite course, 4/7 of student plan on majoring in math, 25/42 plan on majoring in communications, and 2/7 plan on double majoring in math and communications. How many want to major in exactly one of communications or math?
- A $150 eReader comes with a warranty from an electronics business that covers theft (T) and accidental damage (AD) . Due to the high expense of repairing an eReader, it is more cost-effective for the business to provide the customer a complete refund to go toward another one. There is a 5.1% possibility that an AD (Accidenal Claim) claim will be made in any given year. Assume there can only be one claim made (not one of each type).Customers who report an eReader as stolen will get a reimbursement for 80% of the item's full price. A Theft (T) claim is likely to be submitted 3.5% of the time in any given year.What is the anticipated financial benefit or loss for the firm on each contract if the warrantee costs $15.95 for a year?(NOTE: Keep in mind that regardless of whether a claim is made, the consumer will pay for the warranty upfront.)Suppose that in a particular class of 200 students, 31 of them plan on majoring in math, 27 plan onmajoring in history, and 18 plan on double majoring in math and history. How many want to major inexactly one of psychology or math? (Hint: Look at the Venn diagram and figure out which regionscorrespond to “exactly one”; do not try and write the set down!)Determinewhetherthefollowingsequencestendtoinfinityandgiveafullargument establishing your claim (a)an= n/600 - 600/n (b) bn = n^n + (−n)^n (c) cn = 2^(n+2) + (−2)^(n−2)
- A California study concluded that following 7simple health rules can extend a man’s life by 11 yearson the average and a woman’s life by 7 years. These7 rules are as follows: no smoking, get regular exer-cise, use alcohol only in mo deration, get 7 to 8 hoursof sleep, maintain prop er weight, eat breakfast, and do not eat between meals. In how many ways can a personadopt 5 of these rules to follow(a) if the person presently violates all 7 rules?(b) If the person never eats between meals and always exercises daily?Suppose you receive a chain letter withsix names on it, and to keep the chain unbroken, youare to mail a dime to the person whose name is at thetop, cross out the top name, add your name to the bot-tom, and mail it to five friends. If your friends mail outfive letters each, and no one breaks the chain, you willeventually receive dimes. How many sets of mailingsbefore your name is at the top of the list to receivedimes? How many dimes would you receive? (This isa geometric sequence with first term 5.)Also, for each answer is it removable, non-removable, or no discontinuity
- #1. The records of a computer retail store show that out of 50 customers who purchased a desktop computer last month, 36 also purchased a service plan that extends the warranty for an extra year. Out of the 100 customers who purchase a notebook computer last month, 58 purchased the same service plan. Fill in the blanks below to make the most reasonable statement possible. Last month, customers of the store, who purchased _____ computers were more likely to purchase the service plan. That is because __% purchased the service plan, where as __% of the customers who bought ____ computers purchased the service plan.The records of a computer retail store show that out of the 25 customers who purchased a desktop computer last month, all but 5 also purchased a service plan that extends the warranty for an extra year. Out of the 50 customers who purchased a notebook computer last month, all but 5 purchased the same service plan. Fill in the blanks below to make the most reasonable statement possible. Last month, customers of the store who purchased ▼(Choose one:desktop/ ) computers were less likely to purchase the service plan. That is because % did not purchase the service plan, whereas only % of the customers who bought ▼(Choose one) computers did not purchase the service plan.5Suppose that in the first half of a certain season, Dustin Pedroia of the Boston Red Sox batted .300 while Mike Napoli batted only .275. And further suppose that in the seocnd half, Pedroia batted .250 while Napoli batted only .240. Someone claims that Napoli had a higher batting average for the entire season than Pedroia. Is that possible, or must the claim be rejected outright?