The logs are piled such that each row is 2 less than the one below. If the there are 30 logs at bottom and the top most is 2, how many logs are there in all?
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The logs are piled such that each row is 2 less than the one below. If the there are 30 logs at bottom and the top most is 2, how many logs are there in all?
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Answer:
240 log in all
Step-by-step explanation:
d=2
set the row s as n
30 -2(n-1) = 2
2n =28+2
n=15
=15(30+2)/2
=15x16
=240