Mathematic question

It was mentioned in book ( a wonderful science of imam Ali


A Jewish asked imam Ali about a number with all fractures ( 1\2 ……..1\10 ) without remaining . Imam Ali answered him


Multiply ( days of week by days of month by months of year ) you get the solution


Note : 7 × 30 × 12 = 2520

1\2 × 2520 = 1260

1\3 ×2520 = 840

1\4 × 2520 = 630

1\5 × 2520 = 504

1\6 × 2520 = 420

1\7 × 2520 = 360

1\8 × 2520 = 315

1\9 × 2520 = 280

1\10 ×2520 = 252

*Imam is a term in Islam means a leader of people who doesn't think of doing any error infallible

*Imam Ali is a caliph of our prophet Mohammed