Find an explicit formula for a sequence of the form a_(1),a₂,a_(3),... with the initial terms given below: (1)/(4)-1, (1)/(5)-(1)/(2), (1)/(6)-(1)/(3), (1)/(7)-(1)/(4), (1)/(8)-(1)/(5), (1)/(9)-(1)/(6)
a. aₙ = (1)/(n+3) - (1)/(n)
b. aₙ = (1)/(n+4) - (1)/(n+1)
c. aₙ = (1)/(n+2) - (1)/(n-1)
d. aₙ = (1)/(n+5) - (1)/(n+2)