Question

S10=? an=51-3n арифметика прогрессия

Answer 1

Відповідь:

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

a1=51-3*1=48

a10=51-3*10=21

n=10

S10=((48+21)/2)*10=69/2*10=345

Покрокове пояснення:

Answer 2

To find the value of the 10th term (S10) in the arithmetic sequence with the general term an = 51 - 3n, we need to plug in the value of n = 10 into the formula:

an = 51 - 3n

a10 = 51 - 3 * 10 a10 = 51 - 30 a10 = 21

So, the 10th term (S10) in the arithmetic progression is 21.