Question

The Mean Of First N Odd Natural Numbers Is N Square By n^2/81 Find The Value Of N

Answer 1

Answer:

the answer will be must N=81

Answer 2

Answer:

Since, First n odd integers are:

1,3,5,.......(2n−1)

this sequence forms an AP.

∴1+3+5+....(2n−1)=

2

n

[1+2n−1]=n

2

[∵S

n

=

2

n

[a+l]]

Mean =

n

1+3+5+......+(2n−1)

⇒

81

n

2

=

n

n

2

⇒

81

1

=

n

1

⇒n=81