Using pmi prove that 3.6+6.9+9.12+..........+3n(3n+3)= 3n(n+1)(n+2)
Answers
Answered by
4
hey here is your answer..........
Attachments:
![](https://hi-static.z-dn.net/files/d5b/b355de5168f65ba56df80d761fbb734a.jpg)
Similar questions