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There are 399 stones in the pyramid of 19 layers if there are 3 stones at the top and 2 more stones in each layer below this
An equation is an expression that shows the relationship between two or more numbers and variables.
A small pyramid has 3 stones at the top and 2 more stones in each layer below this. This can be represented as an arithmetic progression with first term (a) = 3 and difference (d) = 2, hence:
number of stones in 19 layers = [tex]\frac{19}{2}(2(3)+(19-1)2)=399[/tex]
There are 399 stones in the pyramid of 19 layers if there are 3 stones at the top and 2 more stones in each layer below this
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