Question

Find the sum of2+4+6+ up to nterms

Answer 1

Answer:

Here, a = 2 and d = 2

$sum \: = \frac{n}{2} (2a + (n - 1)d)$

Sum = n/2 ( 4 + (n-1)2)

Sum = n/2 (n +2)

$sum \: = \frac{n( n+ 2)}{2}$

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