In case of mice coat colour, two genes are responsible for colour of the hair. Gene ‘A’ is responsible for distribution of pigments on shaft of hair. Wild type allele of ‘A’ produces a yellow band on dark hair shaft (agouti), whereas recessive allele produces no yellow band. There is another allele of A, known as $$A^Y$$, which is embryonic lethal in homozygous condition only. In an experiment, two yellow mice were crossed to obtain a progeny of 6 pups. What would be the most probable number of agouti mice among them?