ANSWER
A. term = 1 2 3 4 5
number of tiles = 5 8 11 14 17
B. this is arithmetic sequence because the letter mosaic has three move tiles than the previous one
C.number of tiles for tenth mosaic is :
(10- 1) ×3 + 5 = 27+ 5= 3
[ the properties of arthmetic sequence]
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