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How many different words can be formed by using all the letters of word ‘SCHOOL’?

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How many different words can be formed by using all the letters of word ‘SCHOOL’?

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Since ‘SCHOOL’ has 6 letters, out these 6 letters there is 20’s 

Hence number of permutations 

=\(\frac{6!}{2!}\) = 6 × 5 × 4 × 3 × 2 × 1 2 

= 360

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