Find the sum of each of the following
1. integers from 1 to 50
2. odd integers from 1 to 100
3. even integers between 1 and 101
4. first 25 terms of the arithmetic sequence 4,9,14,19,24
5. multiples of 3 from 15 to 45
6. number between 1 and 81 which are divisible by 4
7. first 20 terms of the arithmtic sequence -16,-20,-24 . . .
8.1+5+9+ . . . +49+53
9.1 \2 +3/2+5/2+ . . .+17/2+19/2

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Answers

2016-07-10T15:16:51+08:00
1.)
a1=1,a50=50,n=50,d=1
Sn=n/2 (a1+ an)
S50= 50/2(1+50)
S50=25(51)
S50=1,275
3 3 3