Answer :
Assuming 0 and 100 are included in the possible choices:
There are [tex]\left\lfloor\dfrac{101}7\right\rfloor=14[/tex] multiples of 7 between 0 and 100, so there is a [tex]\dfrac{14}{101}\approx0.1386[/tex] probability of choosing a multiple of 7.
There are [tex]\left\lfloor\dfrac{101}7\right\rfloor=14[/tex] multiples of 7 between 0 and 100, so there is a [tex]\dfrac{14}{101}\approx0.1386[/tex] probability of choosing a multiple of 7.