XXX idea to XXXXXX a Las XXXXX algorithm XXXX two XXXXX carlo XXXXXXXXXX, one XX XXXXX XX XXXX-XXXXXX and XXX XXXXX XXX XXXXX-biased, XX as XXXXXXX.
First XXX XXX XXXXXXXXX A. XX it output XXXX, output XXXX, which is XXXXXXXXXX XX XXXXXXX XX X is XXXX-XXXXXX. Otherwise, XXX algorithm B and if it XXXXXXX XXXXX, XXXXXX false, XXXXX XX XXXXX guaranteed to XX XXXXXXX because B is false-biased. XX X XXXXX't output true, and B doesn't XXXXXX XXXXX, output, which XX that XXX XXXXXXXXX has failed XX find the correct answer.
XXX XXXXX time XXXX takes XX, one XXXX XXX A, XXX call XXX X, and XXXX small additional XXXX XXX XXXXXXXXXXX.
To XXXXXXXXX the XXXXXXX probability, notice that the algorithm succeeds XX X XXXXXXX XXXX, or XX A outputs false and XXXX B XXXXXXX XXXXX. XXX former XXXXXXX XXXX probability, XXXXX the latter happens XXXX XXXXXXXXXXX. XXXXX,.