tristancalderon2 tristancalderon2

24-05-2017
Mathematics

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What is the sum of the first 75 even numbers starting with 2?

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pinkcamogirl pinkcamogirl

24-05-2017

The answer should be 150

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Аноним Аноним

24-05-2017

this an arithmetic sequence with first term = 2 and common difference 2

sum of n terms = (n/2)[2a1 + (n-1)d]

sum of 75 terms = (75/2)[4 + (75-1)2)]

= 5700

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