A tile measures 10cm by 10cm. How many such tiles are required to cover a wall of size 4m and 2.5m?
2 answers:
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According to table :
.
Now, we can find common difference, : second term - first term = 1-(-1) = 1+1=2.
We know formula for a recursive sequance of an arithmetic sequence is
, where n is the number of term and d is the common difference.
If we plug d=2 in that formula, we would get
