Look at the following matchstick pattern of squares (Fig). The squares – InterviewSolution

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1.	Look at the following matchstick pattern of squares (Fig). The squares are not separate. Two neighbouring squares have a common matchstick. observe the patterns and find the rule that gives the number of matchsticks
Answer» If can be observed that in the given matchsticks pattern, the number of matchsticks are 4, 7, 10 and 13. which is 1 more than thrice of the numbers of square in the pattern. Hence, the pattern is 3n +1 Where n is the number of squares.

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