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Q.

If 7x8 is exactly divisible by 9, then the least value of x  is

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a

2

b

0

c

3

d

5

answer is C.

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Detailed Solution

7x8  is exactly divisible by 9

∴7+x+8=9 multiple

15+x=9 multiple

Next 9 multiple is 18

15+x=18

x=18−15=3

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