Mathematics Paper

Once an intelligent boy comes home and tells his father,

"Dad I got an 'F' grade in Maths."

The father is shocked and asks: "Why?"

The son replies: "The teacher asked me what is 6 multiplied by 4. I replied 24. Then she again asked me what is 4 multiplied by 6."

The father gets irritated and exclaims: "So what's the fuckin' difference?"

The son says: "That's the same thing I told my teacher."