Anita's mother start a new shoe shop. To display the shoes, she put 3 pairs of shoes in Ist row, 5 pairs in 2 nd row, 7 pairs in 3 rd row and so on.
(i) If she puts a total of 120 pairs of shoes, then find the number of rows required.
(ii) What is the difference of pairs of shoes in 17th row and 10th row,
(v) Three events which are mutually exclusive but not exhaustive