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Byju's Answer
Standard XII
Mathematics
Conditional Probability
476**0 is div...
Question
476
∗
∗
0
is divisible by both
3
and
11
. What are the non-zero digits in the hundred's and ten's places respectively?
A
8
,
5
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B
6
,
5
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C
6
,
4
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D
2
,
5
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Solution
The correct option is
A
8
,
5
⇒
Let the given number be
476
x
y
0
.
⇒
Then
(
4
+
7
+
6
+
x
+
y
+
0
)
=
(
17
+
x
+
y
)
must be divisible by 3.
⇒
And,
(
0
+
x
+
7
)
−
(
y
+
6
+
4
)
=
(
x
−
y
−
3
)
must be either 0 or 11.
⇒
x
−
y
−
3
=
0
∴
y
=
x
−
3
⇒
(
17
+
x
+
y
)
=
(
17
+
x
+
x
−
3
)
=
(
2
x
+
14
)
⇒
We get
x
=
2
or
x
=
8
⇒
x
=
2
can not be possible, so
x
=
8
⇒
y
=
8
−
3
=
5
∴
x
=
8
and
y
=
5
.
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