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## #1 2017-02-08 09:55:53

### In the series 3,9, 15, ..., what will be the 21st term?

# Aptitude Quizzes Mathematics Aptitude Test

**Question:**

In the series 3,9, 15, ..., what will be the 21st term?

**Option A):**

123**Option B):**

121**Option C):**

129**Option D):**

117

**Correct Answer is Option A):**

123

**Explanation:**

Clearly, 3+6 = 9, 9+6 = 15 So, the series is an A.P. in which a = 3 .and d = 6. 2lst term a +(21-1)xd = a + 20xd = 3+ 20 x 6 = 123.

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## 2017-02-08 09:55:53

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### Re: In the series 3,9, 15, ..., what will be the 21st term?

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