If a1, a2, a3 are in airthemetic as well as geometric progression then which of the following is/are correct?

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answerhappygod
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If a1, a2, a3 are in airthemetic as well as geometric progression then which of the following is/are correct?

Post by answerhappygod »

a) 2a2 = a1 + a3
b) a2 = (a1a3)1/2
c) a2 – a1 = a3 -a2
d) All of the mentioned are correct
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