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Graph of an exponential function y=2+ae^...

Graph of an exponential function `y=2+ae^(-x)` is shown in figure. What is the value of a ?
ltimg src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/ALN_PHY_R04_E01_028_Q01.png" width="80%"gt

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4
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