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Mathematics 6 Online
OpenStudy (xxkesha):

Need an immediate help. Find the sum of all the positive even integers consisting of two digits.

OpenStudy (denonakavro):

Just get a calculator and calculate 12+14+16+18+20+.........98

OpenStudy (welshfella):

this is an arithmetic sequence so you can use the formula for the sum of n terms

OpenStudy (xxkesha):

yeah got it thanks :)

OpenStudy (welshfella):

Sn = (n/2)[a1 + L]

OpenStudy (welshfella):

a1 = 10, L = 98 and n = [(98-10) / 2] + 1

OpenStudy (welshfella):

the series starts with 10 , not 12

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