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If the radius of a sphere is reduced by 50%, by what percentage does its surface area decrease?
A50%
B60%
C75%
D80%
What is the area of an isosceles right triangle with equal sides of length 8 cm?
A16 cm²
B24 cm²
C32 cm²
D64 cm²
What is the probability of picking a prime number from numbers 1 to 10 inclusive at random?
A2/5
B1/2
C3/5
D7/10
A bag contains 5 red, 3 blue, and 2 yellow balls. Two balls are drawn one after another without replacement. What is the probability that both are red?
A1/9
B2/9
C4/9
D5/9
Solve for x: x^2 – 5x + 6 = 0.
Ax = 1, 6
Bx = 2, 3
Cx = -2, -3
Dx = -1, -6
The HCF and LCM of two numbers are 8 and 48 respectively. If one number is 24, find the other number.
A12
B16
C20
D32
A sum of money invested at compound interest doubles in 5 years. In how many years will it become 8 times itself?
A10 years
B12 years
C15 years
D20 years