Which of the following groups is considered “outside” the caste system – formerly known as “untouchables? ” kshatriya shudra brahman dalits

Shudras were considered as untouchables in the previous time in India. The people of these communities belonged to lower castes and were responsible for jobs of janitors, cobblers, etc. They are the fourth varna of the social class system, and now are classified under Scheduled tribes and scheduled class benefit systems. 

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].