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Which of the following statements are true? If a number is divisible by 3, it must be divisible by 9. If a number is divisible by 9, it must be divisible by 3. If a number is divisible by 4, it must be divisible by 8. If a number is divisible by 8, it must be divisible by 4. If a number is divisible by 18, if it is divisible by both 3 and 6. If a number is divisible by both 9 and 10, it must be divisible by 90. If a number exactly divides the sum of two numbers, it must exactly divide the numbers separately. If a number divides three numbers exactly, it must divide their sum exactly. If two numbers are co-prime, at least one of them must be a prime number. The sum of two consecutive odd numbers is always divisible by 4.

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b)True, If a number is divisible by 9, it must be divisible by 3.
d)True,If a number is divisible by 9 and 10 both, then it must be divisible by 90.
g)True, All numbers which are divisible by 8 must also be divisible by 4.
h)True, If a number exactly divides two numbers separately, it must exactly divide their sum.
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