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BITSAT 2011
Exam
BITSAT
Year
2011
Subject
Mathematics
Chapter
Sequences and Series

BITSAT 2011 · Mathematics · Sequences and Series

Find the A.M. of the first ten odd numbers.

Find the A.M. of the first ten odd numbers.

Options

  1. A10
  2. B20
  3. C15
  4. D25

Correct answer

A. 10

Step-by-step solution

First ten odd numbers are 1, 3, 5, 7, 11,13, 15,17,1915,17,19 respectively. So A.M. (xˉ)=1+3+5+7+9+11+13+15+17+1910=10010=10\begin{aligned} (\bar{x})& =\frac{1+3+5+7+9+11+13+15+17+19}{10}\\ & =\frac{100}{10}=10 \end{aligned})
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