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Tham khảo tài liệu 'success step english 8', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CBEST MINI-COURSE Answer This combination problem is a little trickier in that there are not separate groups of items as there were for the slacks and blouses. This question involves the same players playing each other. But solving it is not difficult. First take the total number of players and subtract one 5 - 1 4. Add the numbers from 4 down 1 2 3 4 10. To learn how this works take a look at the following chart Letter the five players from A to E A plays B C D and E 4 games B has already played A so needs to play C D E 3 games C has already played A and B so needs to play D E 2 games D has already played A B and C so needs to play E 1 game E has played everyone Adding up the number of games played 1 2 3 4 gives a total of 10 choice d. This same question might be asked on the CBEST using the number of games 5 chess players played or the number of handshakes that occur when 5 people shake hands with each other once. Other Combination Problems Although the above combination problems are the most common other kinds of problems are possible. The best way to solve other combination problems is to make a chart. When you notice a pattern stop and multiply. For example if you re asked to make all the possible combinations of three letters using the letters A through D start with A AAA ABA ACA ADA AAB ABB ACB ADB AAC ABC ACC ADC AAD ABD ACD ADD There seem to be 16 possibilities that begin with A so probably there are 16 that begin with B and 16 that begin with C and D so multiplying 16 X 4 will give you the total possible combinations 64. Math 9 The Word Problem Game The directions for the word problem game are simple While carefully observing a word problem find all the math words and numbers in the problem. Eliminate the nonessential words and facts in order to find your answer. Operations in Word Problems To prepare for the game make five columns on a sheet of paper. Write one of these words on the top of each column Add Subtract Multiply Divide Equals. Now try to think
