+0  
 
0
844
3
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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 + 21 + 22 + 23 + 24 + 25 + 26 + 27 + 28 + 29 + 30 + 31 + 32 + 33 + 34 + 35 + 36 + 37 + 38 + 39 + 40 + 41 + 42 + 43 + 44 + 45 + 46 + 47 + 48 + 49 + 50 + 51 + 52 + 53 + 54 + 55 + 56 + 57 + 58 + 59 + 60 + 61 + 62 + 63 + 64 + 65 + 66 + 67 + 68 + 69 + 70 + 71 + 72 + 73 + 74 + 75 + 76 + 77 + 78 + 79 + 80 + 81 + 82 + 83 + 84 + 85 + 86 + 87 + 88 + 89 + 90 + 91 + 92 + 93 + 94 + 95 + 96 + 97 + 98 + 99 + 100 =???? the answer is actually pretty funny
 Nov 2, 2012
 #1
avatar+8 
0
it's 5050
 Nov 2, 2012
 #2
avatar+42 
0
There is a formule: S = 1/2 n (n + 1)

Here is n = 100
 Nov 5, 2012
 #3
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0
Aritmetic series:
Sn= n/2* (2a+(n-1)b)
disini (here)
1+2+3+...+100
a= 1 suku Pertama (firts Unit)
b=1 selisih ( diffrerent near units. example : b= 2-1 = 1 b=3-2=1 )
n=100 banyaknya suku ( amount of units)

Sn= n/2 (2a+(n-1)b)
S 100= 100/2 (2*1+(100-1)*1)
S100= 50 (2+99*1)
S100= 50 (2+99)
S100= 50 * 101
S100= 50 * 101
S100= 5050

simple formula for this series
Sn= n/2 *(2+(n-1)1)
Sn= n/2 *(2+n-1)
Sn= n/2 *(n+1) or
Sn= 1/2*n* (n+1)
ok
salam
 Dec 16, 2012

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