Question

Find the sum of 2+4+6..........70 ?​

Answer 1

Answer:

58

Step-by-step explanation:

2+4=6

6+6=12

so we subtract 12 from 70 which is 58

Answer 2

Answer:

This is an Arithmetic sequence.

Sum

=1260

Explanation:

Here d=2 is the Common difference.

a=2is the First term.

l=70 is the last term.

We know that nth

term of this sequence is given by

anth :-an=a+(n−1)d

⇒70=2+(n−1)2

⇒34=n−1

⇒n=35

Total number of terms in the given arithmetic sequence.

∑an={n(a+l) }/2

so, sum={35(2+70) }/2=(35×72) /2=35×36=1260

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