If `a_n` be the term of an A.P. and if `a_7=15`, then the value of the common difference that could makes `a_2a_7a_11` greatest is:

If a_n be the term of an A.P. and if a_7=15 , then the value of the common difference that could makes a_2a_7a_12 greatest is:

In an A.P.t_(7)=15 then the value of common differenced that would make t_(2)t_(7)t_(12) greatest is

If it,be the n^(th) term of an A.P and if t_(7)=9 then the value of the c.d.that would make t_(1)t_(2)t_(7), least is

If 3rd term of an A.P. is 5 and 7th term is 13, then its common difference is :

If an AP a_7=9 and a_1a_2a_7 is least , then common difference is

If the sixth term fo an A.P. is equal to 2 then find the value of the common difference of the A.P which makes the produt a_(1) a_(4) a_(5) the greatest ( the ith term is denoted by a )