1. Find the sum of the first 8 letters of the arithmetic series 6+10+14 . . .
2. Find the sum of all even number from 12 up to 420 . . .
3. Find the sum of all odd integers from 1 to 99 inclusive.
4. Find the sum of all integral multiples of 3 between 7 and 370
5. Find the sum of the terms in the arithmetic sequence where the first term is 52 and contains 20 terms and last is 12
Help me please. Thanks.

2

Answers

2016-07-19T17:17:52+08:00
Here's no. 1
6+10+14+18+22+26+30+34 = 160(arithmetic mean) pls give a thanks ;)
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2016-07-19T17:30:57+08:00
1. S8 = 8/2(6+34)
= 4 (40)
=160
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