\begin{array} { l } { \text { Which of the following form an AP? } } \\ { \text { (A) } 1,1,2,2,3 , \dots } \\ { \text { (B) } 0.3,0.33,0.333 , \dots } \\ { \text { (C) } \sqrt { 2 } , 2,2 \sqrt { 2 } , 4 , \ldots } \\ { \text { (D) } 9,9 + \sqrt { 3 } , 9 + 2 \sqrt { 3 } , 9 + 3 \sqrt { 3 } , \ldots } \end{array}

\begin{array} { l } { \text { Which of the following form an AP? } } \

1.	\begin{array} { l } { \text { Which of the following form an AP? } } \\ { \text { (A) } 1,1,2,2,3 , \dots } \\ { \text { (B) } 0.3,0.33,0.333 , \dots } \\ { \text { (C) } \sqrt { 2 } , 2,2 \sqrt { 2 } , 4 , \ldots } \\ { \text { (D) } 9,9 + \sqrt { 3 } , 9 + 2 \sqrt { 3 } , 9 + 3 \sqrt { 3 } , \ldots } \end{array}
Answer» 1. D) is an APwith common difference√3