54. Exemplar exercise problem XIV

1. Is $0$ a term of the AP: $31, 28, 25, ...$? Justify your answer

 

2. The taxi fare after each $km$, when the fare is $₹15$ for the first km and $₹8$ for each additional $km$, does not form an AP as the total fare (in ₹) after each $km$ is $15, 8, 8, 8, ...$ Is the statement true? Give reasons.