A number is always divisible by 90 if

it is divisible by both 2 and 45

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it is divisible by both 5 and 18

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it is divisible by both 9 and 10

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all the above

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Solution

The correct option is A all the above
∵ If a number is divisible by 'a' and 'b' where 'a' & 'b' are co-primes then that number is divisible by 'ab'
Here $2, 45; 5, 18; 9, 10$ are co-primes

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