The number of flags with three strips in order that can be formed using 2 identical red, 2 identical blue and 2 identical white strips is
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case 1: number of flags =3!=6
case2: when the strips are identical.
number of flags= 3×2× 3!/2!
=6× 6/2
=18.
total number of flags=6+18=24
case2: when the strips are identical.
number of flags= 3×2× 3!/2!
=6× 6/2
=18.
total number of flags=6+18=24
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