Question

find the sum of 5+8+11+.................20 terms​

Answer 1

Answer:

5 + 8 + 11 + 14 + 17 + 20 .

we jump 3 number

HOPE IT WILL HELP YOU !!!!

THANKS

Answer 2

Answer:

S20=20/2(2(5)+(20-1)3)

=10(10+19×3)

=10(10+57)

=670