Question

What is the sum of the first 10 numbers of the arithmetic sequence 1,2,3,……

Sum of how many terms of this sequence starting from the first is 300?​

Answer 1

Answer:

S10=55

S300=46650

Step-by-step explanation:

a=1

d=1

n=10                    S10=10/2(2*1+(10-1)1)|

                           S10=5(2+9)

                           S10=5*11

                           S10=55

When n=300             S300=300/2(2*1+(300-1)1)

                                  S300=150(2+299).

                                  S300=150*311

                                  S300=46650