Question
In how many ways can the letters of the word PARALLEL be
arranged so that all the L's do not come together?Solution
Total letter in word PARALLEL =8 L=3times A=2times 
If all L are considered as one, then the number of letters is -6. A=2times Total ways of L come together =6! /2! =6×5×4×3=360 Now total ways of L's do not come together=3360-360 =3000
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