If the 15 – digit number 4a5124356789734 is divisible by 9, then the value of “a” is _____.
Given:
Given number 4a5124356789734
Formula Used:
Divisibility Rule of 9: Sum of digits should be divisible by 9
Solution:
Sum of digits = 4 + a + 5 + 1 + 2 + 4 + 3 + 5 + 6 + 7 + 8 + 9 + 7 + 3 + 4 = 68 + a
To be divisible by 9 the sum should be 72 hence the value of a = 4 can make the sum 72
Hence the number 445124356789734 is divisible by 9
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