If 2515 is divided by 13, the reminder is _________ .
Now, 2515 = (26 – 1)15
= 15C02615 – 15C12614 + …. + 15C1426 – 15C15
= (15C02615 – 15C12614 + …. + 15C1426 – 13) + 12
Therefore, it is clear that, when we divide 2515 by 13, we get 12 as the remainder.