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x + y + z = 15 if 9, x, y, z, a are in A...

`x + y + z = 15` if `9, x, y, z, a` are in A.P., while `1/x +1/y +1/z=5/3` if `9, x, y, z, a` are in H.P., then the value of a will be

A

1

B

2

C

3

D

9

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The correct Answer is:
A
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