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Question
Mathematics
If 3x = 5 (mod 7), then
Q. If
3
x
=
5
(
m
o
d
7
)
, then
1779
217
COMEDK
COMEDK 2014
Sets
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A
x = 2 (mod 7)
19%
B
x = 3 (mod 7)
19%
C
x = 4 (mod 7)
39%
D
none of these
23%
Solution:
3
x
=
5
(
m
o
d
7
)
=
12
[
∵
12
=
5
(
m
o
d
7
)]
x
=
4
(
m
o
d
7
)
∴
o
pt
i
o
n
holds