Question

Find a 4-digit odd number using each of the digit 1,2,4,5 only once such that when first and last digits are interchanged,it is divisible by 4

Answer 1

Answer:

2415, 2125, 4521

Step-by-step explanation:

Divisibility rule 4: number  formed by last 2 digits must be divisible by 4

So we have only two options-  12, 24

Since resultant number to be odd number, we  can have 5412, 5124 or 1524 as divisible by 4

When we interchange first and last digits, we get 2415, 2125 or 4521