1yaa thank u.. i did both of them....!! :)
1.find the number of ways in which m boys and n girls may be arranged in a row so that no two girls are together . given that m>n
2. In an exam,10 candidates have to appear. 4 candidates are to appear in maths and rest in different subjects.in how many ways can they be seated in a row if candidates appearing in maths are not to sit together.
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3 Answers
491. first seat m boys.
then find out the places where, if we place girls at least one boy will come in between...
that is all places with 2 boys on either sides or on the extreme ends.. m+1 places..
now arrange n girls in m+1 seats :)