वास्तविक संख्याओं R पर 2 × 2 आव्यूहों के वलय (ring) M2(R) पर विचार कीजिए। निम्नलिखित में से कौन सा कथन सत्य है?

In the polynomial ring &mathbb;Q[x], if f(x) = x3 + x2 + x + 1 and g(x) = x3 - x2 + x - 1, then the ideal ⟨f(x), g(x)⟩ generated by f(x) and g(x) is equal to:

Which of the following algebraic structures forms an Abelian group under the usual operation?