(b) Write the first four triangular numbers. – InterviewSolution

1.	(b) Write the first four triangular numbers.
Answer» this is theTriangular NumberSequence: 1, 3, 6, 10, 15, 21, 28, 36, 45, ... This sequence comes from a pattern of dots that form atriangle: By adding another row of dots and counting all the dots we can.

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