class 12th math chapter 1 relation & function, (a b) R (c d) if and only if a+d = b+c

class 12th math chapter 1 relation & function, (a b) R (c d) if and only if a+d = b+c most important previous year board exam question .............

Видео class 12th math chapter 1 relation & function, (a b) R (c d) if and only if a+d = b+c канала kewal sir math classes