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Lilian Whitaker
13 December, 21:41
how do i do this? 1+3+5+7 + ... + 101
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Jazmie
13 December, 22:35
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Total numbers from pattern=51
First number+last number is 1+101=102
second number+second last number is 3+99=102.
This means that we can form pairs that make up 102.
Number of pairs=50/2=25
The remaining middle number is 26
Total value of pair=25*102
Total sum of pattern=25*102+26=
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Harold Henson
13 December, 22:45
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Hello,
Number of terms in 1+3+5+7 + ... + 101
nb = (101-1) / 2+1=51
Sum = ((1+101) * 51) / 2=51²=2601
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