1.

Consider the sets T(n)={n, n+3, n+5, n+7, n+9} where n=1,2,3,.....,99. How many of these sets contain 5 or any integral multiple there of (i.e. any one of the numbers 5, 10, 15, 20, 25, ...) ?

Answer»

81
79
80
none

Answer :B


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