Techr: agr 1 aur 1 2 hote hain aur 2 aur 2 4 hote hain

aur 3 aur 3 6 hote hain

phir 7 aur 7 kitne hon ge?

Studnt: sir,

asaan wale ap ne khud hal kr lye
aur mushkil wala mere lye chor diya. :-)

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