Q. 14.4( 17 Votes )

# Look at these tri

Answer :

The number of dots in first 3 triangles are 3, 6 and 10 respectively.

The difference between the first two terms is 6-3 = 3

And 10-6 = 4

The series continues 3, 4, 5…

Hence, this forms an AP with first term as 3 and common difference as 1

Next two terms are 4 + 1 = 5

And 5 + 1 = 6

So 4^{th} pattern has 10 + 5 = 15 dots

5^{th} pattern has 15 + 6 = 21 dots

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