Quantitative Aptitude - Arithmetic Ability Questions

If  a+1/a = 3, then a3+1a3?

The 3rd and 7th term of an arithmetic progression are -9 and 11 respectively. What is the 15th term?

If √x ­- √y = 1 , √x + √y = 17 then √xy = ?

Select the odd letters from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

Select the odd word/letters/number/number pair from the given alternatives.

AB is a chord of the circle and its center is “O”. ON is perpendicular to AB. If the length of AB=20 cm, ON-(2√11) cm, find the radius (in cm) of the circle.

Simple interest on a sum of Rs 3300 for 5 years is Rs 1980. What is the annual rate (in percentage) of interest?