In a row of girl students facing north, Radhika is 10th to the left of Purnima who is 21th from the right end. If Monika who is 17th from the left end is 4th to the right of Radhika, how many students are there in the row?

Question

In a computer game, each move requires pressing a button. When the button is pressed for the first time, as a move, the computer randomly chooses a cell from a 4x4 grid of sixteen cells and puts an "X" mark on that cell. When the button is pressed subsequently, the computer randomly chooses a cell from the remaining unmarked cells and puts an "X" mark on that cell. This goes on till the end of the game. The game ends when either all the cells in any one row, or all the cells in any one column, are marked with "X". What is the maximum possible number of times a player has to press the button to finish the game?

Answer 1

There are a total of 43 students in the row.

Purnima is 21st from the right, implying her position from the left is \(N - 20\).
Radhika is 10 positions to the left of Purnima, so her position is \(N - 30\).
Monika is 4 positions to the right of Radhika, placing her at \(N - 26\).
Since Monika is also 17th from the left, \(N - 26 = 17\).
Solving this equation gives \(N = 43\).

Thus, the row contains 43 students.

In a row of girl students facing north, Radhika is 10th to the left of Purnima who is 21th from the right end. If Monika who is 17th from the left end is 4th to the right of Radhika, how many students are there in the row?

The Correct Option is C

Solution and Explanation

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