Charles built a tower of cubes with an edge 2 cm long. In the lowest layer there were 6 cubes (in one row) in six rows, in each subsequent layer always 1 cube and one row less. What volume in cm3 did the whole tower have?

Correct answer:

V =  728 cm3

Step-by-step explanation:

a=2 cm  V1=a3=23=8 cm3  n=6 6+5 5+4 4+3 3+2 2+1=91  V=n V1=91 8=728 cm3

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