Factorial
explicit formula
recursive formulas
advanced problems
100

The definition of a factorial.

What is a number multiplied by every term before it?

100

The eqution to write in explicit formula

What is an = a1 x rn-1?

100

The recursive formula for 2,4,8,16

what is a1= 2 and ak=2(ak-1)?

100

The exlixit formula from a1=4 and ak=2(ak-1)

What is an=4 x 2n-1

200

The answer to 5!.

What is 120?

200

The explicit formula for 10,20,40,80,160...

What is an = 10 x 2n-1?

200

The first 5 terms for a1=5 and ak= 5(ak-1)

What is 5,25,125,625,3125?

200

Both recursive and explicit formula for 13,-52,208,-832...

what is explicit formula as an= 13 x -4n-1 and recursive as a1=13 and ak=14(ak-1)?

300

The answer to 6!/3!.

What is 120?

300

The first four terms for an = 7 x -1n-1

What is 7, -7,  7, -7?

300

The first 5 terms for a1=400 and ak=ak-1/4

What is 400,100,25,6.25,1.56?

300

The 9th term of the sequence -5,10,-20,...

What is -1280?

400

The answer to 8!/4!

What is 1,680?

400

The explicit formula for 3, -12, 48, -192

What is an = 3 x -4n-1

400

The recursive formula for 3,9,27,81,...

What is a1=3 and ak=3(ak-1)?

400

The larger 9th term from the sequences an=30n or an= 1 x 2n-1

What is an=30n with a 9th term of 270?

500

The answer to n!/n-1!

What is n?

500

The first four terms of an=100 x .5n-1

What is 100, 50, 25, 12.5?

500

The first 4 terms for a1=1 and ak=ak-1/3

What is 1,1/3,1/9,1/27?

500

The 11th term of the sequence a1=3 and ak=4(ak-1)

What is 3,145,728?