Option 3 : 9

**Given:**

34 × 35 = 3x

**Concept used:**

a^{m }× a^{n} = a^{m + n}

**Calculation:**

34 × 35 = 3x

⇒ 3^{4 + 5} = 3^{x}

⇒ 3^{9} = 3^{x}

⇒ x = 9

**∴ The value of x is 9**

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