Find digit x if 51x7 is divisible by 9.

Type: MCQ • Marks: 1

A. 3

B. 6

C. 4

D. 5

Explanation

Sum of digits = 5 + 1 + x + 7 = 13 + x. For divisibility by 9, 13 + x = 18 => x = 5.

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Class 7th Ganita Prakash 1

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