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Standard VI
Mathematics
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How many 4-di...
Question
How many 4-digits numbers are there in all ?
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Solution
a
=
1000
,
d
=
1
,
a
n
=
9999
a
n
=
a
+
(
n
−
1
)
1
8999
=
n
−
1
n
=
9000
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