Mathematics
Write the elements of the set
{x : x = 3y - 1, y ∈ N and 8 < y ≤ 12}.
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Answer
{x : x = 3y - 1, y ∈ N and 8 < y ≤ 12}
y = 9
x = 3y - 1 = 3 x 9 - 1
x = 27 - 1 = 26
y = 10
x = 3y - 1 = 3 x 10 - 1
x = 30 - 1 = 29
y = 11
x = 3y - 1 = 3 x 11 - 1
x = 33 - 1 = 32
y = 12
x = 3y - 1 = 3 x 12 - 1
x = 36 - 1 = 35
Hence, the elements are 26, 29, 32 and 35
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