Question

Find the average of first nine counting numbers

Answer 1

1+2+3+4+5+6+7+8+9=45
total no.s are9
therefore,45/9=5
the average of first nine counting no.s is 5

Answer 2

Hey mate!

Here is yr answer....

Counting nos. are also called as natural nos.

So, the average of first 9 natural nos. ----

[ n(n+1)/2 ]

n = 9

=> 9(9+1)/2

=> 9(10)/2

=> 90/2

=> 45

So, the average of first 9 natural nos. = 45

Hope it helps...

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