PLS CALCULATE HM FOR THIS ???

Mahesh sharma (CPT STUDENT) (102 Points)

05 May 2011

the hamonic mean of 1 , 1/2 , 1/3 .............. 1/n is

a ) 1 / n+1

b) 2 / n+1

c) n+1 / 2

d) 1 / n - 1

give workings also

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Aranis (article) (55 Points)
Replied 05 May 2011

Originally posted by : Mahesh sharma
	the hamonic mean of 1 , 1/2 , 1/3 .............. 1/n is a ) 1 / n+1 b) 2 / n+1 c) n+1 / 2 d) 1 / n - 1 give workings also

total no. of observations is 'n'

sum of reciprocal of elements 1/1 + 1/1/2 + 1/1/3 ....1/1/n or

1+2+3+4+....n = n(1+n)/2 ( sum of AP)

so hm is n/n(1+n)/2

which comes to 2/n+1 this is the answer option no. 2

should be correct

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Mahesh sharma (CPT STUDENT) (102 Points)
Replied 27 May 2011

Thanks very much bro......... god bless........

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