Mathematics arithmetic sequence

The sum of second and sixth terms of an arithmetic sequence is 4. The third term is 24 more than eleventh term. So determine the first three terms of the sequence.

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  1. a+d + a+5d = 4
    a+2d = a+10d + 24

    Collect terms and solve for a and d. Then write a,a+d,a+2d

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  2. 14-3n

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  3. First three terms 11,8,5

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  4. I really don't understand this sequence... help plz

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