ECAT Practice Questions - Engineering Colleges Admission Test (ECAT) Exam

What is the sum of the first n terms of an arithmetic series with first term a and common difference d?

n [a + (n-1)d] n/2 [2a + (n-1)d] n/2 [a + (n-1)d] n [2a + (n-1)d]

n/2 [2a + (n-1)d]

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