What is the next letter in the series : O T T F F S S ?

প্রশ্ন: What is the next letter in the series : O T T F F S S?

সমাধান:
O - One
T - Two
T - Three
F - Four
F - Five
S - Six
S - Seven
E - Eight

∴ পরবর্তী বর্ণটি হবে E