(?)²+ (123)² = (246)² - (99)²- 2462

(3)⁸ X (3)⁴ = ?

A printer numbers the pages of a book starting with 1 and uses 3189 digits in all. How many pages does the book have ?

The L.C.M of 3, 2.7 and 0.09 is:

1201.964 – (0.121 x 0.231 x 0.191) =?

If there are 10 positive real number n₁ < n₂ < n₃ ... < n₁₀. How many triplets of these numbers (n₁, n₂, n₃), (n₂, n₃, n₄), .... can be generated such that in each triplet the first number is always less than the second number, and the second number is always less than the third number?

The Product of the L.C. M and H.C.F of two numbers is 24. The difference of two numbers is 2. Find the numbers.

12.5% of 550 - 11% of 221 =? – 1.56

Find the wrong number in the series: 2, 9, 28, 65, 126, 216, 344