1.

One of the most important techniques of counting is the principle of exlcusion and inclusion. Let A_(1),A_(2),……………,A_(m) be m sets and n(A_(1)) represents the cardinality of the set A_(1) (the number of elements in the set A_(1))) then according to the principle of exlusion and inclusion. n(A_(1)uuA_(2)uu.........uuA_(m)) =sum_(i=1)^(m)n(A_(1))-sum_(i=j)n(A_(i)nnA_(j))+sum_(iltjltk)n(A_(i)nnA_(j)nnA_(k))-...........+(-1)^(m+1)n(A_(1)nnA_(2)nn........nnA_(m)) In particular if A,B,C are three sets, then n(AuuBuuC)=n(A)+n(B)+n(C)-n(AnnB)-n(BnnC)-n(CnnA)+n(AnnBnnC). Principle of exclusion and inclusion must be applied whenever there is a chance of repeated counting of some of the samples. The number of natural numbers less than or equal to 2985984, which are neither perfect squares nor perfect cubes is

Answer»

2984124
2984244
2959595
None of these

Answer :a


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