Counterexamples disprove all three: for (i), n = 4 gives 4(16) + 1 = 65 = 5 × 13; for (ii), n = 10 gives 121 = 11²; for (iii), n = 3 gives 67? No, n = 2 gives 19, n = 3 gives 67, n = 4 gives 259 = 7 × 37.

Class 9 Ganita Manjari part 2 chapter 9.1 solutions
Class 9 Ganita Manjari Part 2 chapter 9 Page 6 Question Answer