Question

A rock filled dam has been built across the channel to store

Answer 1

A dam is a structure built across a river or stream to hold back water. People have used different materials to build dams over the centuries. Ancient dam builders used natural materials such as rocks or clay. Modern-day dam builders often use concrete

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Answer 2

Answer:

This answer can be generalized to tossing N fair coins simultaneously, and getting R heads (and N - R tails). Now line the coins up in any you wish.

This answer can be generalized to tossing N fair coins simultaneously, and getting R heads (and N - R tails). Now line the coins up in any you wish.What is the probability of getting R heads?

This answer can be generalized to tossing N fair coins simultaneously, and getting R heads (and N - R tails). Now line the coins up in any you wish.What is the probability of getting R heads?First, the heads can be in any of the R positions out of the N possible positions.

This answer can be generalized to tossing N fair coins simultaneously, and getting R heads (and N - R tails). Now line the coins up in any you wish.What is the probability of getting R heads?First, the heads can be in any of the R positions out of the N possible positions.The number of ways of doing this is (NR) .

This answer can be generalized to tossing N fair coins simultaneously, and getting R heads (and N - R tails). Now line the coins up in any you wish.What is the probability of getting R heads?First, the heads can be in any of the R positions out of the N possible positions.The number of ways of doing this is (NR) .To get the probability, we divide this by the total number of ways you can flip N coins, which is 2N , since each coin can be a heads or a tail.

This answer can be generalized to tossing N fair coins simultaneously, and getting R heads (and N - R tails). Now line the coins up in any you wish.What is the probability of getting R heads?First, the heads can be in any of the R positions out of the N possible positions.The number of ways of doing this is (NR) .To get the probability, we divide this by the total number of ways you can flip N coins, which is 2N , since each coin can be a heads or a tail.So the probability is (NR)2N .

Now that we have a general answer, we can plug in your numbers to get your particular answer.

Now that we have a general answer, we can plug in your numbers to get your particular answer.(NR)2N=(42)24=6/16=3/8 .