The First Four Triangular Numbers Are {1, 3, 6, 10

question 65

Multiple Choice

The first four triangular numbers are {1, 3, 6, 10, . . . }, and are illustrated in the following diagram. Write the recursive general term for the sequence of triangular numbers.

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Definitions:

Base Year

A reference year used in economics for comparative purposes, allowing the calculation of index numbers or real values.

Consumer Price Index

An index measuring the weighted average of prices of a basket of consumer goods and services, such as transportation, food, and medical care.

Base Year

A specific year against which economic or financial data is compared to measure economic performance over time.

Structural Unemployment

A type of unemployment resulting from a discrepancy between the skills available in the workforce and those required by employers.