Question

Which numbers among 2,3,5,6,9 divides 12345 exactly? write 12345 in reverse order and test now which numbers divide it exactly ?​

Answer 1

Answer:

3 and 5 divides the no. 12345 exactly.

If we write 12345 in reverse order, then it will be 54321 and again it would be exactly divided by the no. 3 and 5.

Explanation:

here, i have used a simple trick that is,

if we add up all the numbers, such that 1+2+3+4+5=15 and the no. 15is divided only by two numbers that is 3and5. this trick is only applicable on the numbers 3,5and 9