Question 1

What is the formula to find the sum of an arithmetic sequence?

Accepted Answer

Sn = (n/2)(2a1 + (n-1)d)

Answer

Sn = (n/2)(2a1 + nd)

Answer

Sn = (n/2)(a1 + (n+1)d)

Answer

Sn = (n/2)(a1 + (n-1)c)

Question 2

What is the formula to find the nth term of a geometric sequence?

Accepted Answer

an = a1 * r^(n-1)

Answer

an = a1 + r^(n-1)

Answer

an = a1 * r^n

Answer

an = a1 + (n-1)r

Question 3

What is the formula to find the sum of a finite geometric sequence?

Accepted Answer

Sn = a1 * (1 - r^n) / (1 - r)

Answer

Sn = a1 * (1 - r^n) / (1 + r)

Answer

Sn = a1 * (1 + r^n) / (1 - r)

Answer

Sn = a1 + r^n / r

Question 4

What is the formula to find the common ratio of a geometric sequence?

Accepted Answer

r = a2 / a1

Answer

r = (a1 + a2) / 2

Answer

r = a1 * a2

Answer

r = a1 / a2

Question 5

What is the formula to find the common difference of an arithmetic sequence?

Accepted Answer

d = a2 - a1

Answer

d = a1 + a2

Answer

d = (a1 + a2)/2

Answer

d = a1 - a2

Question 6

What is the formula to find the sum of a finite arithmetic sequence?

Accepted Answer

Sn = (n/2)(a1 + an)

Answer

Sn = (n/2)(2a1 + (n-1)d)

Answer

Sn = (n/2)(a1 + (n-1)d)

Answer

Sn = (n/2)(a1 + an - 1)

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