Question

find the Sum of sequence
5, 9, 13 to 20 terms
​

Answer 1

Solution

a(20)=5+(20-1)4=5+76=81

s(20)=[20(5+81)]/2=10(86)=860

Answer 2

Answer:

ok let's start

Step-by-step explanation:

5+9+13+17+21+25+29+33+37+41+45+49+53+57+61+65+69+73+77+81=860