How many numbers among 51, 62, 84, 97 are divisible by 9?

Correct option is B

Given:
Numbers: 51, 62, 84, 97
Formula Used:
Divisibility rule of 9: A number is divisible by 9 if the sum of its digits is a multiple of 9.
Solution:
Check the sum of digits for each given number:
For 51: 5 + 1 = 6 (Not divisible by 9)
For 62: 6 + 2 = 8 (Not divisible by 9)
For 84: 8 + 4 = 12 (Not divisible by 9)
For 97: 9 + 7 = 16 (Not divisible by 9)
None of the numbers have a digit sum that is divisible by 9. Therefore, exactly 0 numbers are divisible by 9.
Final Answer
So the correct answer is (b)