Question

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

Answer 1

Answer:

2380 is the answer

hope this answer of mine helps you

Answer 2

$\huge\mathbb\red{ANSWER}$

$\large{\boxed{\sf sum\:is\:2380}}$

Step-by-step explanation:

1+4+7+10+......+118

Here the above are in A.P.

where,

a=1

d=3

an=l=118

Now,

an=a+(n-1)d

After putting values and solving it we get the value of n

i.e.

$\large{\boxed{\sf n=40}}$

Now,

Sn= n/2{2a+(n-1)d}.

After putting values and solving it we get the value ofSn

i.e.

$\large{\boxed{\sf Sn=2380}}$

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