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Arithmetic Progressions — Maths STD 11 Science — Question

CBSE BoardEnglish MediumSTD 11 ScienceMathsArithmetic Progressions2 Marks
Question
Find the A.M. between:
12 and -8
✓

Answer

12 and -8
Let A be the arithem atic mean of 12 and -8
Then,
12, A, -8 are in A.P
$\Rightarrow\text{A}-12=-8-\text{A}$
$\Rightarrow\text{A}=\frac{12+(-8)}{2}=2$
$\therefore\text{A.M is 2}$

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