Can the numbers 12,6 , 6 be used to form the sides of a triangle

No

Step-by-step explanation: 6, 6, and 12 can't be sides of a triangle since 2 sides have to add up to more than the other side and can't be equal or less than. If sides 6 + 12 = 18, 18 > 6, however if 6 + 6 are added then 12=12 and will make it not a triangle.

3, 12, 48, 384, 1536, 6144, 24576, 98304

step-by-step explanation:

just keep timing it by 4.

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