The First 7 letter of English alphabet are
asranged in a row. The no. of assangements
in which A, B and C are never separated
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Step-by-step explanation:
Firstly, we must find the total number of letters=7
No of letters which cannot be separated= 3(A,B,C)
No of Letter that can be separated = 7-3 =4
Therefore total no of combination where 3 letters are not separated
= 7*6*5*4=840 ways
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