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Byju's Answer
Standard IV
Mathematics
Encoding and Decoding Patterns
How many word...
Question
How many words (with or without meaning) of three distinct letters of english alphabet are there?
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Solution
We
know
that
there
are
26
distinct
letters
.
So
,
the
first
place
can
be
filled
by
any
one
of
these
letter
.
Number
of
ways
of
filling
first
place
=
26
Now
,
second
place
can
be
filled
by
any
one
of
the
remaining
25
letters
.
Numer
of
ways
of
filling
second
place
=
25
Now
,
third
place
can
be
filled
by
any
one
of
the
remaining
24
letters
.
Numer
of
ways
of
filling
third
place
=
24
So
,
required
number
of
words
with
three
distinct
letters
=
26
×
25
×
24
=
15600
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