Question

find the sum of the following APs:
2.7. 12,
..to 10 terms.
0 0.6,1.7.2.8. .... to 100 ter
Find de sus given below:​

Answer 1

Answer:

a = 2

d = 7-2=5

n =10

an = a + (n-1) d

= 2+(10-1)5

= 2+9*5

= 47

sn = n /2(a + an)

= 10/2( 2+47)

= 5( 49)

= 245