Question by Love the Name of Jiang

11/03/2017 at 19:20

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Vongola 11/03/2017 at 22:39

I think it easy for you
Love the Name of Jiang selected this answer.
Trịnh Đức Phát 22/03/2017 at 12:48

Put : A = 1.3 + 3.5 + 5.7 + ...... + 99.101

=> 4A = 1.3.(5 - 1) + 3.5.(7 - 3) + ...... + 99.101.(103 - 99)

=> 4A = 1.3.5 - 1.3.5 + 3.5.7 - 3.5.7 + ...... + 99.101.103

=> 4A = 99.101.103

=> A = 99.101.103/4

=> A = ..................
In the name of love 12/03/2017 at 10:01

172650
Vongola 11/03/2017 at 22:38

Answered is 172650