One Day a Jewish person came to Sayyidina Ali ra., thinking that since Ali thinks he is too smart, I’ll ask him such a tough question that he won’t be able to answer it and I’ll have the chance to embarrass him in front of all the Arabs.
He asked ” Ali ra., tell me a number, that if we divide it by any number from 1-10 the answer will always come in the form of a whole number and not as a fraction.”
Sayyidina Ali ra. looked back at him and said, “Take the number of days in a year and multiply it with the number of days in a week and you will have your answer.”
The Jewish person got astonished but as he was a polytheist (Mushrik), he still didn’t believe Ali ibn Abu Talib He calculated the answer Ali ra gave him.
To his amazement he came across the following results: The number of Days in a Year = 360 (day prophetic Jewish, source) The Number of Days in a Week = 7
The product of the two numbers = 360 x 7 = 2520
Now…
2520 : 1 = 2520
2520 : 2 = 1260
2520 : 3 = 840
2520 : 4 = 630
2520 : 5 = 504
2520 : 6 = 420
2520 : 7 = 360
2520 : 8 = 315
2520 : 9 = 280
2520 : 10= 252
Source:
Imam Ali ibn Abi Talib, The First Intellectual Muslim Thinker
by Dr.Muhammad Abdul Rauf, pg 98-102