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        Fig        Working             Unit cubes

          1          2(1) -1 = 2-1=            1                        

          2         2(2)-1 = 4-1=            3

         etc….

(a)     5         2(5)-1 = 10-1=          9

(b)     19        2(19)-1=38-1=        37             

(c)  nth term = 2n-1

2n-1 = 169

2n = 170

n = 85   means Figure 85 has 169 unit cubes.

1 Reply 1 Like

Yes, good equation of 2n -1.

I’ve thought of another equation 2(n-1) + 1.  Works to be the same as 2n -1 lol.

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