Given:
54321A is divisible by 9
Concept Used:
Divisibility law of 9 ⇒ A number is divisible by 9 if the sum of its digit is divisible by 9.
Calculation:
Sum of digits of 54321A = 5 + 4 + 3 + 2 + 1 + A
⇒ 15 + A
If we put A = 3
⇒ 15 + 3
⇒ 18
We know, 18 is divisible by 9.
∴ The required value of A is 3
