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State 'T' for true and 'F' for false .
I. A sequence is an A.P ., if and only if the sum of its n terms is of the form `An^(2) +Bn` , where A and B are constants .
II. If 18, a, b , `-3` are in A.P., then `a+b = 15` .
III If a,c,b are in A.P., then `2c=a+b` .
IV .The `n^(th)` term from the end of an A.P. is the `(m-n+1)^(th)` term from the beginning , where m terms are in A.P.

A

`{:("I","II","III","IV"),("F","F","T","T"):}`

B

`{:("I","II","III","IV"),("T","T","T","F"):}`

C

`{:("I","II","III","IV"),("F","T","T","F"):}`

D

`{:("I","II","III","IV"),("T","T","T","T"):}`

Text Solution

Verified by Experts

The correct Answer is:
d
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