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Byju's Answer
Standard VI
Mathematics
How Many Numbers Can Be Formed Using a Certain Number of Digits?
If 3 × 2- is ...
Question
If
3
x
2
¯
is a multiple of 11, where x is a digit, what is the value of x?
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Solution
Sum
of
the
digits
at
odd
places
=
3
+
2
=
5
Sum
of
the
digit
at
even
place
=
x
∴
Sum
of
the
digit
at
even
place
-
Sum
of
the
digits
at
odd
places
=
(
x
-
5
)
∵
(
x
-
5
)
must
be
multiple
by
11
.
∴
Possible
values
of
(
x
-
5
)
are
0
,
11
,
22
,
33
.
.
.
But
x
is
a
digit
;
therefore
x
must
be
0
,
1
,
2
,
3
.
.
.
9
.
∴
x
-
5
=
0
⇒
x
=
5
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