<PRE><B>Question 772466</B>
Notice that when you start adding up odd
numbers starting with 1:
1 = 1
1 + 3 = 4
1 + 3 + 5 = 9
1 + 3 + 5 + 7 = 16
1 + 3 + 5 + 7 + 9 = 25
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So, if you have {{{ n }}} odd numbers starting 
with 1, then Sum = {{{ n^2 }}}
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There are 5 odd numbers below 10
There are 4 odd numbers below 8
Following this, there are 15 odd numbers below 30
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Sum = {{{ 15^2 }}}
Sum = {{{ 225 }}}
Average = {{{ n^2 / n }}}
Average = {{{ 225/15 = 15 }}}


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