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Bachelor of Tourism Studies (BTS)
Statistics for Tourism Business
Q. The mean duration of the series : a,a+d,a+2d,………,a+2n from its mean is (Solved)
1. n(n-1)
2. n(n-1)/2
3. n(n+1)/2
4. n(n+1)d/2n+1
d. n(n+1)d/2n+1
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