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If the first and the (2n-1)^th term of a...

If the first and the `(2n-1)^th` term of an A.P,G.P anf H.P are equal and their nth term are a,b,c respectively,then

A

a=b=c

B

`agt=bgt=c`

C

a+c=b

D

`ac-b^2=0`

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The correct Answer is:
1,2&4
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