a lady gives a dinner party to six quests.the number of ways may be selected fromamong 10 friends,if two of the friends will not attend the party together is
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total no of ways to select 6 frm 10=10C6=210
total ways of selecting the 2 always = 2C2×8C4=70
so req no ways = 210 - 70 = 140
total ways of selecting the 2 always = 2C2×8C4=70
so req no ways = 210 - 70 = 140
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