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So its 35?

You want to find the sum to the twelfth term.
So you use the formula n/2 * (a + L)

That is the whole question.

222

@JackJordan can you explain your formula?

It's standard a-level formula needs no explaining.

So which ones the right answer? I'm kind of confused.

The answer is 222. My calculator malfunctioned earlier on.

in all honesty so am I, I never seen this formula before. i'm only in 8th grade