Multiple choice
For this circuit, what is the probability that measuring all 4 qubits yields exactly |0010⟩ (qubit 0 leftmost)?
const c = circuit(4); c.h(0); c.h(1); c.cx(0, 2); c.cx(1, 2); c.h(0); c.h(1); c.measure(); return c;
Commit your prediction for P(|0010⟩) — then run it.