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October 20, 2014

October 20, 2014

Posted by **Nancy** on Monday, January 5, 2009 at 11:43pm.

Could someone explain to me how to solve this? Which geometric formula would I have to use?

- Gr.11 Math -
**bobpursley**, Tuesday, January 6, 2009 at 12:01amTHE first layer 5

second layer 5x3

third layer 5x3x3

see the pattern?5*3^(n-1)

where n is the layer.

employees total is the sum of all of these. Looks like a geometric series..

- Gr.11 Math -
**Reiny**, Tuesday, January 6, 2009 at 12:04amIf you call the five senior managers as the first level, then in the second level there would be 15 and in the third level there would be 45

so you want the 7th term in this sequence, not the sum of 7 terms (because you would be counting the same people again and again)

so a=5, r=3, and t(7) = ar^6 = 5(3)^6 = 3645

check my arithmetic.

- Gr.11 Math -
**Mae**, Tuesday, January 6, 2009 at 12:05amUse the formula

Sn = a(r^n-1)

--------

r-1

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