00:40:33 NCERT Exercise 5.3 Question 4 How many terms of the AP : 9, 17, 25, . . . must be taken to give a sum of 636?

00:47:03 NCERT Exercise 5.3 Question 5 The first term of an AP is 5, the last term is 45 and the sum is 400. Find the number of terms and the common difference.

00:49:03 NCERT Exercise 5.3 Question 6 The first and the last terms of an AP are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is their sum?

00:52:33 NCERT Exercise 5.3 Question 7 Find the sum of first 22 terms of an AP in which d = 7 and 22nd term is 149.