sayan640 wrote:

"The x co-ordinate is 3 and the y co-ordinate is 4. You can make 7*6 = 42 such arrows. "

Hi Karishma,

Many thanks in advance...

Will you please tell me how you got this ?

" You can make 7*6 = 42 such arrows.[/color]"

How you got 7*6 ?

x is between 0 and 9 (inclusive) and y is between 0 and 9 (inclusive).

So if we need the length of x to be 3, we can start it anywhere from x = 0 to x = 6 (7 cases).

If we start the arrow at x = 7, with a length of 3, it will mean that the end point of the arrow will have x co-ordinate of 10 (which is not allowed).

So for the x co-ordinate, you have 7 options.

Similarly, the length of y should be 4 so we can start it anywhere from y = 0 to y = 5 (6 cases)

If we start the arrow at y = 6, with a length of 4, it will mean that the end point of the arrow will have y co-ordinate of 10 (which is not allowed).

So for the y co-ordinate, you have 6 options.

Hence you get a total of 7 * 6 = 42 acceptable cases.

_________________

Karishma

Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >

GMAT self-study has never been more personalized or more fun. Try ORION Free!