How many four digit numbers, which are divisible by 6, can be formed using the digits 0, 2, 3, 4, 6, such that no digit is used more than once and 0 does not occur in the left-most position?

In how many ways can 8 identical pens be distributed among Amal, Bimal, and Kamal so that Amal gets at least 1 pen, Bimal gets at least 2 pens, and Kamal gets at least 3 pens?

If f(ab) = f(a)f(b) for all positive integers a and b, then the largest possible value of f(1) is

How many different pairs (a, b) of positive integers are there such that a ≤ b and 1/a + 1/b = 1/9?

Let f(x) = 2x − 5 and g(x) = 7 − 2x. Then |f(x) + g(x)| = |f(x)| + |g(x)| if and only if

Let a₁, a₂, a₃, a₄, a₅ be a sequence of five consecutive odd numbers. Consider a new sequence of five consecutive even numbers ending with 2a₃. If the sum of the numbers in the new sequence is 450, then a₅ is

An infinite geometric progression a₁, a₂, a₃, … has the property that aₙ = 3(aₙ₊₁ + aₙ₊₂ + …) for every n ≥ 1. If the sum a₁ + a₂ + a₃ + … = 32, then a₅ is

If log(2^a × 3^b × 5^c) is the arithmetic mean of log(2² × 3³ × 5), log(2⁶ × 3 × 5⁷), and log(2 × 3² × 5⁴), then a equals

If a₁ = 1/(2×5), a₂ = 1/(5×8), a₃ = 1/(8×11), ……, then a₁ + a₂ + a₃ + … + a₁₀₀ is