The cost of a piece of jewellery is proportional to the square of its weight. A piece of jewellery weighing 10 grams is INR 3600. The cost of a piece of jewellery of the same kind weighing 4 grams is

The sum of the first 15 terms in an arithmetic progression is 200, while the sum of the next 15 terms is 350. Then the common difference is

When the square of the difference of two natural numbers is subtracted from the square of the sum of the same two numbers and the result is divided by four, we get

The lengths of the sides of a triangle are x, 21 and 40, where x is the shortest side. A possible value of x is

In a 400-metre race, Ashok beats Bipin and Chandan respectively by 15 seconds and 25 seconds. If Ashok beats Bipin by 150 metres, by how many metres does Bipin beat Chandan in the race?

Suppose a, b and c are integers such that \(a > b > c > 0\), and \(A=\begin{bmatrix}a&b&c\\b&c&a\\c&a&b\end{bmatrix}\). Then the value of the determinant of A

The set of all possible values of f(x) for which \((81)^x + (81)^{f(x)} = 3\) is

The set of real values of x for which the inequality \(\log_{27} 8 \le \log_3 x < 9^{\frac{1}{\log_2 3}}\) holds

Let A and B be two sets such that the Cartesian product \(A \times B\) consists of four elements. If two elements of \(A \times B\) are (1, 4) and (4, 1), then