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Byju's Answer
Standard VII
Mathematics
2 Digit Numbers
how many numb...
Question
how many numbers of two digits are divisible by 3 ?
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Solution
The
list
of
2
-
digit
numbers
divisible
by
3
is
:
12
,
15
,
18
,
.
.
.
.
.
.
.
.
,
99
.
Now
,
the
above
list
forms
an
AP
with
first
term
,
a
=
12
and
common
difference
,
d
=
3
Let
a
n
=
99
⇒
a
+
n
-
1
d
=
99
⇒
12
+
n
-
1
×
3
=
99
⇒
3
n
-
1
=
87
⇒
n
-
1
=
29
⇒
n
=
29
+
1
⇒
n
=
30
So
,
there
are
30
two
-
digit
numbers
that
are
divisible
by
3
.
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