A=1x2x3x4+2x3x4x5+3x4x5x6+...+97x98x99x100
5xA=1x2x3x4+2x3x4x5x(6-1)+3x4x5x6x(7-2)+...+97x98x99x100x(101-96)
5xA=1x2x3x4x5+2x3x4x5x6-1x2x3x4x5+3x4x5x6x7-2x3x4x5x6+...+97x98x99x100x101-96x97x98x99x100
5xA=97x98x99x100x101
A=97x98x99x101x20=1901009880
A=1x2x3x4+2x3x4x5+3x4x5x6+...+97x98x99x100
5xA=1x2x3x4+2x3x4x5x(6-1)+3x4x5x6x(7-2)+...+97x98x99x100x(101-96)
5xA=1x2x3x4x5+2x3x4x5x6-1x2x3x4x5+3x4x5x6x7-2x3x4x5x6+...+97x98x99x100x101-96x97x98x99x100
5xA=97x98x99x100x101
A=97x98x99x101x20=1901009880
A=1x2x3x4+2x3x4x5+3x4x5x6+...+97x98x99x100
5xA=1x2x3x4+2x3x4x5x(6-1)+3x4x5x6x(7-2)+...+97x98x99x100x(101-96)
5xA=1x2x3x4x5+2x3x4x5x6-1x2x3x4x5+3x4x5x6x7-2x3x4x5x6+...+97x98x99x100x101-96x97x98x99x100
5xA=97x98x99x100x101
A=97x98x99x101x20=1901009880
A=1x2x3x4+2x3x4x5+3x4x5x6+...+97x98x99x100
5xA=1x2x3x4+2x3x4x5x(6-1)+3x4x5x6x(7-2)+...+97x98x99x100x(101-96)
5xA=1x2x3x4x5+2x3x4x5x6-1x2x3x4x5+3x4x5x6x7-2x3x4x5x6+...+97x98x99x100x101-96x97x98x99x100
5xA=97x98x99x100x101
A=97x98x99x101x20=1901009880
A=1x2x3x4+2x3x4x5+3x4x5x6+...+97x98x99x100
5xA=1x2x3x4+2x3x4x5x(6-1)+3x4x5x6x(7-2)+...+97x98x99x100x(101-96)
5xA=1x2x3x4x5+2x3x4x5x6-1x2x3x4x5+3x4x5x6x7-2x3x4x5x6+...+97x98x99x100x101-96x97x98x99x100
5xA=97x98x99x100x101
A=97x98x99x101x20=1901009880