Question 390917
{{{1/(1*4)+1/(4*7)+1/(7*10)+1/(10*13)+1/(13*16)}}}
={{{1/4 + (2/7 - 1/4) + (3/10 - 2/7) + (4/13 - 3/10) + (5/16 - 4/13)}}}
=  {{{5/16}}}.