Question

write first five terms of a.p
when a= -1 and d=-4​

Answer 1

Answer:

It can be observed that in the given matchstick pattern, the number of matchsticks are 3.5,7, and 9, which is 1 more than twice Of the number Of triangles in the pattern.

Hence, the pattern is 2n+1, where n is the number of triangles.