Which one set of letters when placed sequentially in the blanks will complete the following series correctly ?
a _ c a _ b _ a _ _ b c _ a b _ c c _ a a b _ c _
Mathematics is like checkers in being suitable for the young, not too difficult, amusing, and without peril to the state.
Plato
Mathematics has 25%formulas, 25%proofs and apply 25%thinking and 25%efforts.
In real life situations proofs are nothing but already existed stories(we know the solutions from all experienced people).
formulas are nothing but goals. we have so many goals b