mean of 1+2+3+4.......x is 6x/11 find x
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sum of first n natural numbers is
= n(n+1)/2.
hence sum of first x natural numbers is
=x(x+1)/2.
mean of x numbers is
= x(x+1)/2x=x+1/2.
according to the question
=x+1/2=6x/11
=11x + 11=12x
=11=12x-11x
=11=1x
=11=x
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