Seven boxes M, N, O, P, Q, R and S are kept one over the other, but not necessarily in the same order. Only three boxes are kept above P. Only two boxes are kept between P and M. Only R is kept between S and Q. Only N is kept between O and M. Neither Q nor M is at the topmost position. Which box is kept between Q and O?
Each of the digits in the number 56137428 is arranged in ascending order from left to right. The position of how many digits will remain unchanged as compared to that in the original number?
What is the sum of 7xy + 5yz – 3zx, 4yz + 9zx – 4y, –3xy + 5x – 2xy?
5x – 4y + 2xy + 9yz + 6zx
5x – 4y – 2xy + 9yz + 6zx
5x – 4y + 6xy + 9yz + 6zx
5x – 4y + 6xy + 9yz – 6zx