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Identify the variables, constants, terms and number of terms in each of the following expressions:
 
(I) 13+b 
 
(II) 17+13b
 
(III) 20b+24a+13
 
(IV) 13+17a+20b
 
S.NoExpressionsVariablesConstantTermsNumber of terms
 (I) 13+b   ,
 (II) 17+13b   ,
 (III) 20b+24a+13 ,   , ,
 (IV) 13+17a+20b ,   , ,