Question

find the following sum:
1+4+7+10....+118​

Answer 1

Answer:

yes it is right 140 solve it

Answer 2

Answer:

the sum is 2380.

Step-by-step explanation:

Here ,

a = 1

d = 3

l = 118

-> a(n) = a + (n - 1)d

   118 = 1 + (n - 1)3

   118 = 1 + 3n - 3

   118 = 3n - 2

   118 + 2 = 3n

   120 = 3n

   n = 120/3

   n = 40

-> s(n) = n/2(a + l)

          = 40/2 (1 + 118)

          = 40/2 * 119

          = 2380

So , the sum of given AP is 2380.

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