Question

b) (4 + 8 + 12 + 16 + ... + 100) : (2 + 4 + 6+ ... + 50);
03
+ 150)​

Answer 1

_(4+ 8+12+16+ ... + 100)_ =

      (2+ 4+ 6+ ... +50)

_(1·4+ 2·4+ 3·4+ 4·4+ ... +25·4)_ =

      (1·2+ 2·2 + 3·2+ ... +25·2)

 

_4·(1+ 2+ 3+ 4+ ... +25)_ =

 2·(1+ 2+ 3+ 4+... +25)

_4_

 2

2