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## #1 2017-11-02 17:06:27

**shakeel123****Moderator**- Registered: 2017-09-21
- Posts: 50,796

### if a, d and Sn are the first terms, the common difference and t...

# ECAT Engineering Exams Quizzes MCQs Quizzes ECAT Engineering Entry Test 2017 Mathematics Sequences and Series

**Question:**

if a, d and Sn are the first terms, the common difference and the sum of first n terms of the series , then Sn =

**Option A):**

n[2a + (n-1)d]**Option B):**

n/2[a + (n-1)d]**Option C):**

a + (n-1)d**Option D):**

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

**Correct Answer is Option D):**

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

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## 2017-11-02 17:06:27

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### Re: if a, d and Sn are the first terms, the common difference and t...

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