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प्रश्न
Write the following in roster form
{x ∈ N : 4x + 9 < 52}
उत्तर
4x + 9 < 52
4x + 9 – 9 < 52 – 9
4x < 43
x < `43/4` (i.e.) x < 10.75 4
But x ∈ N
∴ A = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
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