Question

1.2+2.3+3.4+4.5...+99.100+101

Answer 1

A=(5-0).1.2.3.4+(6-1).2.3.4.5+...+(101-96).97.98.99.100

A=1.2.3.4.5-0+2.3.4.5.6-1.2.3.4.5+...+97.98.99.100.101-96.97.98.99.100

A=97.98.99.100.101=9505049400

A=1901009880