what is individual series , discrete series , continuos series
The answer to your question has already been covered in our study material. Follow the given link and scroll down to 'Statistical Series on the Basis of Construction'.
https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/statistics-for-economics/organisation-of-data/443_2495_6424#slide2_variables-and-their-classification-types-of-statistical-series
https://www.meritnation.com/cbse/class11-commerce/studymaterial/economics/statistics-for-economics/organisation-of-data/443_2495_6424#slide2_variables-and-their-classification-types-of-statistical-series