Grade 11 Math competition Round 1

What is the difference between an arithmetic and geometric sequence?

• Arithmetic = add & multiply, Geo = subtract & divide

• Arithmetic = add & subtract, Geo = multiply & divide

• Arithmetic = add & divide, Geo = subtract & multiply

• Arithmetic = subtract & divide, Geo = add & multiply

Determine whether the sequence in the table is arithmetic, geometric, or neither.

• arithmetic

• geometric

• neither

4, 10, 16, 22, 28, ...

Which recursive formula represents the sequence?

4, 15, 26, 37, 48, ...

Write an explicit equation and a recursive equation to represent the sequence.

Which term is 12,288 in the sequence given by: 3, 6, 12, 24, ...

• 11

• 12

• 13

• 14

An arithmetic sequence has a₁₅=160 and a common difference of -15. Find a₄₀.

• 535

• 370

• -170

• -215

• 96

• 63

• -33

Find the sum of the first 25 terms of the series: 6+14+22+30+...

• 450

• 2650

• 2550

• 550

Find the indicated sum for the geometric series.

S₆ for (-4/5) + 8 + (-80) + 800 + ....

• _S6 = 21,845

• _S6 = 72,000

• 10

• 0

• 1

• 4