In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[Q]: Most solenoids have _ tabs with holes for mounting.
[A]: two


[Q]: Smokers tend to become disabled and retire early _ times more than non-smokers.
[A]: six


[Q]: Many genes are redundant, since knocking out some genes result in _ obvious phenotype.
[A]:
no