Q2 Without expanding, find the value of :
a+b 2a+b 3a+b 2a+b 3a+b 4a+b 4a+b 5a+b 6a+b
Solution
a+b | 2a+b | 3a+b |
2a+b | 3a+b | 4a+b |
4a+b | 5a+b | 6a+b |