If the mean of first n natural numbers is 5n/9 , then find n.
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Answer:
Step-by-step explanation:
n=9
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Step-by-step explanation:
the mean of first n natural numbers is (n+1/2)
given,
the mean of first n natural numbers is 5n/9
=> n+1/2=5n/9
by cross multiplication
=> 9(n+1)=2(5n)
=> 9n+9=10n
=> 10n-9n=9
=> n=9
therefore, "n" value is "9".
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