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OpenStudy (anonymous):
Hi, I need some help. find the fourth term in the expansion of (3x+y)^7 Could somone tell me what it is, and also explain it please? thanks!
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jimthompson5910 (jim_thompson5910):
Do you have pascal's triangle with you?
OpenStudy (anonymous):
yes
jimthompson5910 (jim_thompson5910):
ok, list out the numbers in the row that starts with "1, 7, etc etc"
OpenStudy (anonymous):
like 1,7,21,35?
jimthompson5910 (jim_thompson5910):
yes, the fourth number in that sequence is 35, so that will be the value of the coefficient C C = 35
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jimthompson5910 (jim_thompson5910):
|dw:1429319314234:dw|
OpenStudy (anonymous):
Ok now what? is that it?
jimthompson5910 (jim_thompson5910):
|dw:1429319331928:dw|
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