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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:
2+4+6+8+10.......+200

What is the sum of only the even numbers from 2 -200
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:

a=2
d=2
n=?
L=200
L=a+(n+1)d
200=2+(n+1)2
n=98..
Using Sn=n/2(a+L) to find the sum.
Sn=98/2(2+200)
Sn=9898.

At all at all not correct
Re: Mathematics Question For A Brain work out by Kendzyma(m): 11:35pm On May 12, 2015
quickly:


At all at all not correct
sign mistake. Modified.

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