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Option (a) 21 is the correct answer.
Step-by-step explanation:
In this pattern, we have
In the 1st triangle, 1 + 2 = 3...
In the 2nd triangle, 3 + 3 = 6...
In the 3rd triangle, 6 + 4 = 10...
In the 4th triangle, 10 + 5 = 15...
So, according to this pattern, 15 + 6 = 21
Hence, there will be 21 dots in the next triangle.
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