7. What is the next fraction in each of the following patterns?
a. 1/40,4/40, 9/40, 16/40, 25/40..?.
b. 3/101,4/101,7/101, 11/101, 18/101, 29/101...?
c. 5/1 ,10/2, 9/2, 18/4, 17/8, 34/32, 33/256...?