6. If mean of first n natural number is l number is 5 9 then n= (a)5 (b)4 (c)9 (d)10​

Question

6. If mean of first n natural number is l number is 5

9

then n=

(a)5 (b)4 (c)9 (d)10​

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Sophia 1 month 2021-08-14T08:31:01+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-08-14T08:32:13+00:00

    Answer:

    9

    Step-by-step explanation:

    It is given that the mean of first n natural numbers is  
    5n/9

    ⇒n+1/2=5n/9

    ⇒9n+9=10n

    ⇒n=9  

    0
    2021-08-14T08:32:55+00:00

    Step-by-step explanation:

    c)9

    It is given that the mean of first n natural numbers is

    9

    5n

    .

    Therefore,

    n

    1+2+3+…+n

    =

    9

    5n

    2

    n+1= 9

    5n

    ⇒9n+9=10n

    ⇒n=9

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