Here's why:
* Saal mein ek baar: The letter "E" appears once in the word "SAAL".
* Mahine 2 baar: The letter "E" appears twice in the word "MAHINE".
* Hafte 4 baar: The letter "E" appears four times in the word "HAFTE".
* Roz 6 baar: The letter "E" appears six times in the word "ROZ".