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提问人：网友zhb_999 发布时间：2022-01-06

[主观题]

The number of connections C that can be made through a switchboard to which T telephones a

re connected is given by the formula C = T(T-1)/2. How many more connections are possible with 30 telephones than with 20 telephones？

A．435

B．245

C．190

D．45

E．10

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更多“The number of connections C that can be made through a switchboard to which T telephones a”相关的问题

第1题

The open-economy macroeconomic model includes

A、only the market for loanable funds.

B、only the market for foreign-currency exchange.

C、both the market for loanable funds and the market for foreign-currency exchange

D、neither the market for loanable funds or the market for foreign-currency exchange.

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第2题

Supplementary Reading Choose the best answer to each of the following questions according to what is stated or implied in the text. In the sub-title “Buying less of the same stuff,” what does “less” mean?

A、Less frequency

B、Less quantity

C、Less volume

D、Lower price

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第3题

The cost, in dollars, for an appliance repair at a certain company is 1.2p + 20h, where p is the wholesale price of the parts, in dollars, and h is the number of hours it takes to repair the appliance. What is the cost of repairing an appliance if the wholesale price of the parts is $15 and it takes 2 hours to repair it？

A．$12

B．$18

C．$20

D．$40

E．$58

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第4题

For which of the following pairs of integers is the least common multiple of the integers minus their greatest common divisor the greatest？

A．3,12

B．5,6

C．10,20

D．11,12

E．15,30

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第5题

Column A Column B

The number that is as much greater

than 63 as it is less than 101 84

A．if the quantity in Column A is greater

B．if the quantity in Column B is greater

C．if the two quantity are equal

D．if the relationship cannot be determined from the information given

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第6题

A certain spiral staircase is designed so that each step after the first one is turned 20° counterclockwise from the one immediately below it, how many of the steps make up 2.5 complete revolutions？

A．18

B．36

C．38

D．45

E．50

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第7题

If n is any prime number greater than 2, which of the following CANNOT be a prime number？

A．n-4

B．n-3

C．n-1

D．n+2

E．n+5

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第8题

Mrs. Jones sold two houses for $80, 000 each. One house was sold at a 20 percent loss and the other at a 20 percent gain.

Column A Column B

The gain minus the loss 0

A．if the quantity in Column A is greater

B．if the quantity in Column B is greater

C．if the two quantity are equal

D．if the relationship cannot be determined from the information given

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第9题

The 4 beads in a bag are identical except that 2 are red and 2 are blue. If 2 beads are to be simultaneously and randomly selected, what is the probability that they will both be blue？

A．1/6

B．1/4

C．1/3

D．1/2

E．5/6

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第10题

What is the maximum number of nonover-lapping regions into which 3 lines can divide the interior of a circle？

A．4

B．6

C．7

D．8

E．9

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