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permutation problems plz solve
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hi abhijeet Q2) since there is no condition on the persons not selected therefore let us place them first Let the persons not selected be A,B,C,D,E,F _A_B_C_D_E_F_ therefore the persons which are selected(4) have 7 places for themselves to select therefore no. of ways of selecting 4 places out of 7 are 7C4= 35 ways In these type of questions we must place the elements having no condition on them first & then proceed further. |
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