anonymous
  • anonymous
find the sum of the numbers from 1to100
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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amistre64
  • amistre64
start adding :)
amistre64
  • amistre64
or we can focus on a smaller list to develop a formula
anonymous
  • anonymous
50*101

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anonymous
  • anonymous
S = ( n / 2 ) ( A + T ) wherein... S is the sum of the "n" terms A is the first term T is the last term n is the number of terms "sum of the whole numbers from 1-100"... there would be 100 terms wherein the first term is 1 and the last term is 100. substituting it to the equation... S = ( n / 2 ) ( A + T ) S = ( 100 / 2 ) ( 1 + 100 ) S = ( 50 ) ( 101 ) S = 5,050
amistre64
  • amistre64
spose we want the sum of the first 4 numbers 1+2+3+4 we can double this to make life easier, simply flip it around and add the columns 1+2+3+4 4+3+2+1 --------- 5+5+5+5 since each column is equal to the first + the last terms ... this gives us: n(first + last) but that is twice what we need, so halve it n(first + last)/2
amistre64
  • amistre64
of course you can probably confuse people if you want to say the sum of the 3rd term and the third to the last term :)

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