He does not need any introduction, on account of his famous No error .
on account of
The doctor diagnosed the patient's disease on the basis of the symptom and prescribed necessary medicinal . No error
on the basis of
If his accusations true , there would be a number of senior officials held accountable for corruption . No Error .
If an excerpt from any published materials is used , the source of such an extract should be mentioned . No Error.
The manager's appraisal report on his subordinate's performance was rejected as it was deemed to be biased . No Error.
For every novel in the library there are 2 science books; for each science book there are 7 economics books. Express the ratio of economics books to science books to novels in the library as a triple ratio.