exam Maths Puzzle Numerical Ability

Find the sum, if it exists, for the infinite geometric sequence.
a[1]=4, r= 1/3 (I am not sure how the one next to the a should be written. I think it is described as a sub 1 or

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exam Other Question

You dive directly upward from a board that is 48 feet high. After t seconds your height above the water is described by the polynomial.

-16t^2+32t+48

a. Factor the polynomial
Out of 450 students of a school, 325 play football, 175 play cricket and 50 either play football or cricket. How many students play both football and cricket?
A. 75 B. 100 C. 225 D. 150