1 * 2 * 3 / 1 + 2 * 3 * 4 / 1 + 3 * 4 * 5 / 1 +. 48 * 49 * 50 / 1 simple algorithm you just calculated a problem for me, help me

1 * 2 * 3 / 1 + 2 * 3 * 4 / 1 + 3 * 4 * 5 / 1 +. 48 * 49 * 50 / 1 simple algorithm you just calculated a problem for me, help me

1/1*2*3+1/2*3*4+.+1/48*49*50
= 1/2 *[(3-1)/(1*2*3)+(4-2)/(2*3*4).+(50-48)/(48*49*50)]
=1/2 * [1/(1*2)-1/(2*3)+1/(2*3)-1/(3*4).+1/(48*49)-1/(49*50)]
=1/2*(1/2-1/2450)
=306/1225