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OpenStudy (xxkesha):
Need an immediate help. Find the sum of all the positive even integers consisting of two digits.
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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
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OpenStudy (welshfella):
the series starts with 10 , not 12
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