- 6
- 4
- 5
- 1

Option 3 : 5

**Concept used:**

When a number is dividing by 88 than it also is dividing by 8 and 11

**Calculation:**

645x2y2 is divisible by 88 than last 3-digit divide by 8 and difference between even number and odd number is divide by 11

⇒ after calculate by above method we get y = 3(least value) and x = 8

⇒ 4x – y^{3} = 32 – 27 = 5

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