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Mathematics Question For A Brain work out by quickly: 10:28pm On May 12, 2015 |
2+4+6+8+10.......+200 (no calculator) What is the sum of only the even numbers from 2 -200? |
Re: Mathematics Question For A Brain work out by quickly: 10:51pm On May 12, 2015 |
1 of formulaes will give u the answer !) an= a1 + (n-1)d 2) Sn= n(a1 + an)/2 |
Re: Mathematics Question For A Brain work out by Kendzyma(m): 10:55pm On May 12, 2015 |
quickly:a=2 d=2 n=? L=200 L=a+(n-1)d 200=2+(n-1)2 n=100.. Using Sn=n/2(a+L) to find the sum. Sn=100/2(2+200) Sn=10100 |
Re: Mathematics Question For A Brain work out by quickly: 11:23pm On May 12, 2015 |
Kendzyma: At all at all not correct |
Re: Mathematics Question For A Brain work out by Kendzyma(m): 11:35pm On May 12, 2015 |
quickly:sign mistake. Modified. |
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