a) T1=7*1+1=8
T2=7*2+1=15
T3=7*3+1=22
T4=7*4+1=29
T5=7*5+1=36
.......................
T40=7*40+1=281
b) T1=7*1+1=8
T2=7*2+1=15
T3=7*3+1=22
T4=7*4+1=29
T5=7*5+1=36
.......................
T75=7*75+1=526
c) T1=7*1+1=8
T2=7*2+1=15
T3=7*3+1=22
T4=7*4+1=29
T5=7*5+1=36
.......................
Tn=7n+1=1513
7n+1=1513
7n=1513-1
7n=1512
n=1512:7
n=216