Question

How many term of ap 5,8,11... add upto 670​

Answer 1

Answer:

here,

A.P = 5,8,11........ 670

a = 5

d = 3

Tn = a+(n-1)d

670= 5+(n-1)3

670= 5+3n-3

670= 2+ 3n

670-2= 3n

668=3n

668/3= n

Answer 2

Answer:

_____

ln=20l is the answer

l____l

sum of 20 terms is 670.