Campus Maths Puzzle Logical Reasoning

Find the number of rectangles 5x5 square matrix (A square is also considered a rectangle)

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Campus Other Question

my percentile in various sections in elitmus are as follows:-
1)verbal-93.53
2)quant-98.02
3)reasoning-88.95
1,2,3,4,5,6,7 are arranged such that sum of two successive numbers is a prime number. For example, 1234765 (i.e. 1+2=3, 2+3=5, 3+4=7....)
1. How many such possible combinations occur?
2. How many possible combination occurs if first number is 1/7 and last number is 7/1 (i.e 1xxxxx7 or 7xxxxx1)?
3. How many numbers will come on 4th position(xxx_xxx)?