00:02:03 NCERT Exercise 5.2 Question 17 Find the 20th term from the last term of the AP : 3, 8, 13, . . ., 253.

00:06:23 NCERT Exercise 5.2 Question 18 The sum of the 4th and 8th terms of an AP is 24 and the sum of the 6th and 10th terms is 44. Find the first three terms of the AP.

00:11:03 NCERT Exercise 5.2 Question 19 Subba Rao started work in 1995 at an annual salary of ₹5000 and received an increment of ₹200 each year. In which year did his income reach ₹ 7000?

00:15:53 NCERT Exercise 5.2 Question 20 Ramkali saved ₹ 5 in the first week of a year and then increased her weekly savings by ₹ 1.75. If in the nth week, her weekly savings become ₹ 20.75, find n.