Objective+14

Okay so im pretty sure no one else did this objective, which is evaluating factorials.

There are two ways to do factorials on your calculator, and there may be more, but I only know the 2. You can do it the long way, and punch in 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1, or you can punch in 10 on your home screen, then hit MATH, then go to PRB, and then hit 4 which is the ! mark.

1st Example

Evaluate 4!

A) 10 B) 9 C) 176 D) 24

Correct Answer = D

Because...

You would do 4 x 3 x 2 x 1, or 4!

4 x 3 = 12 12 x 2 = 24 24 x 1 = 24

2nd Example

Evaluate 6!/5!

A) 21 B) 6/5 C) 6 D) 720

Correct Answer = C

Because...

You can either put 6!/5! into you calculator, and you will get 6, or else you can go 6 x 5 x 4 x 3 x 2 x 1 / 5 x 4 x 3 x 2 x 1. When you divide like that, the reason the answer is 6 is because of elimination. Both factorials have 5 x 4 x 3 x 2 x 1, so they cancel each other out, and you are left with 6.

3rd Example

Evaluate 4! + 6!

A) 17 280 B) 34 560 C) 372 D) 744

Correct answer = D

Because...

Once again, you can either put this in your calculator or do it by hand. To do it by hand just go 4 x 3 x 2 x 1 =24, and 6 x 5 x 4 x 3 x 2 x 1= 720, then add them together, and you get 744. Mr Max--you told me to give you a wink wink nudge nudge for this page and the bolded part, so here it is.