Question

Write the set in roster form: {x : x = 7a, a∈N and 3<a≤7}​

Answer 1

Given:-

• {x : x = 7a, a∈N and 3<a≤7}

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To find:-

• Set in roster form.

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Solution:-

According to the question,

Here,

→ A = {x : x = 7a, a ∈ N and 3 < a ≤ 7}

Now,

→ a = {4, 5, 6, 7}

Then,

→ A = {(7 × 4), (7 × 5), (7 × 6), (7 × 7)}

→ A = {28, 35, 42, 49}

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Hence,

• The set in Roster form is {28, 35, 42, 49}.