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Mathematics
Problem
In the expansion of
(
a
+
b
x
)
6
(a+bx)^{6}
(
a
+
b
x
)
6
, the coefficient of
x
3
x^{3}
x
3
is 40 while that of
x
4
x^{4}
x
4
is 50. Find the ratio
a
:
b
a:b
a
:
b
. a)
5
:
3
5:3
5
:
3
b)
4
:
5
4:5
4
:
5
c)
3
:
5
3:5
3
:
5
d)
2
:
3
2:3
2
:
3
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