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## Answers

Therefore AP : 2+4+6+... upto n

For finding the sum of all the numbers in an AP there is a formula. The formula is

Sum =

where n = number of elements of the AP

a = first element of the AP

d = the common difference (ie the 1st element - 2nd element)

sum =

sum = n[n+1]

mean = sum of all elemets ÷ total number of elements

mean = n(n+1)÷n

mean = n+1

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