Find the sum of the ff:
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: numbers between 1 and 81 which are divisible by 4
7: first 20 terms of the arithmetic sequence -16, -20. -24
8: first 10 terms of the arithmetic sequence 10.2, 12.7, 15.2, 17.7
9: 1+5+9+... +49+53
10: 1/2+3/2+5/2... +17/2+19+2

1

Answers

2016-07-10T13:57:35+08:00
1. S=1+2+3.....+48+49+50 Or by formula: n(n+1)/2 50•(50+1)/2 = 1225 2. 1,3,7,9... or all numbers that cannot be divided exaclty by 2 3. 2,4,6,8... all numbers that arr multiples of 2 are called even numbers
2 4 2
thank you.
no.9 answer >> 1+5+9+13+17+21+25+29+33+37+41+45+49+53 d=4 s=378