How many blue squares will the next term in the series have?
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Solution
From the image, we can see that in each term one more row of blue squares gets added at the bottom with one more square than the last row.
So, in the next term, another row with 5 squares gets added at the bottom. Thus, it will have
1 + 2 + 3 + 4 + 5 = 15 blue squares.