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AVprozaik [17]
3 years ago
15

Coefficient of y^15x^2 in expansion of (y^3+x)^7

Mathematics
2 answers:
Hitman42 [59]3 years ago
7 0
The coefficient of y∧15×∧2 in expansion of (y∧3+x)∧7 is (15×2)+(3×7)= 51
Bess [88]3 years ago
4 0
Hello,


(x+y^{3})^7 =

x^7+7x^{6}y^{3}+21x^{5}y^{6}+35x^{4}y^{9}+35x^{3}y^{12}+21x^{2}y^{15}+7xy^{18}+y^{21}\\


Coefficient=21=2P7=7*6/2!
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