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nth Term of A.P

Find the arit...

Question

Find the arithmetic mean between $11$ and $100$ .

A

55.5

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B

56.3

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C

57.5

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D

54.3

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Solution

The correct option is B $55.5$
$a_{1} = 11 a_{2} = 100 A M = \frac{a_{1} + a_{2}}{2} = \frac{11 + 100}{2} = \frac{111}{2} = 55.5$

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