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What is the expansion of (x + y)^3?
Ax^3 + y^3 + 3xy
Bx^3 + 3x^2y + 3xy^2 + y^3
Cx^3 + x^2y + xy^2 + y^3
Dx^3 + 3xy + y^3
If a + b = 10 and a – b = 4, what is the value of a * b?
A16
B21
C24
D28
If 15% of a number is 45, what is 40% of that number?
A100
B120
C140
D150
A shopkeeper buys an article for Rs. 400 and sells it for Rs. 500. What is his profit percentage?
A20%
B22.5%
C25%
D30%
Which component of solar radiation causes sunburn and skin cancer upon prolonged exposure?
AInfrared rays
BVisible light
CUltraviolet (UV) rays
DMicrowaves