A line makes angles α, β and γ with the positive directions of the coordinate axes. If →a = (sin²α)î + (sin²β)ĵ + (sin²γ)k̂ and →b = î + ĵ + k̂, then what is →a · →b equal to?

What is the arithmetic mean of 8², 9², 10², …, 15²?

Let X be a random variable following binomial distribution whose mean and variance are 200…

The probability of a man hitting a target is 1/5. If the man fires 7…

If two fair dice are tossed, then what is the probability that the sum of…

If P(A) = 1/3, P(B) = 1/2 and P(A ∩ B) = 1/4, then what…