Question

Consider the sequence of 3-digit number which are multiple of 5.
a. Write the frist term of the sequence.
b. Write the last term of the sequence.
c. Find the number of terms?
d.Find the sum of terms?​

Answer 1

Step-by-step explanation:

a. a=100

b. an=995

c. an=995

d=5

an= a+(n-1)d

=100 +(n-1)5=995

=n-1=995-100/5

=n=179+1

n=180

d.Sn=n/2(a+an)

=180/2(100+995)

=90×1095

=98550.