7.
A man walks 1 KM towards East and then he turns to South and walks 5 km. Again he turns to east and walks 2 km, after this he turns to North and walks 9 km. Now, how far is he from his starting point?
17.
In the following series of numbers, find out how many times, 1 , 3 and 7 have appeared together, 7 being in the middle and 1 and 3 on either side of 7?