The cofficients of X is 7 X cube
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Answer:
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Step-by-step explanation:
coefficient of x
7
in [2+
3
x
]
n
is
n
C
7
(2)
n−7
(
3
1
)
7
coefficient of x
8
in [2+
3
x
]
n
is
n
C
8
(2)
n−8
(
3
1
)
8
⟹
n
C
7
×(2
n−7
)×
3
7
1
=
n
C
8
×(2
n−8
)×
3
8
1
⟹
n
C
7
n
C
8
=6
⟹
8
n−7
=6
⟹n=55
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