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OpenStudy (acacia):
Find S25 for 1/2 + 1 + 3/2 + 2 +...
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OpenStudy (acacia):
this is Arithmetic Sequences and Series
OpenStudy (cwrw238):
each term increases by 1/2
OpenStudy (cwrw238):
do you know the formula for sum of n terms of an AS?
OpenStudy (acacia):
no
OpenStudy (cwrw238):
Sn = (n/2)[2a + (n-1)d] where n = no.of terms, a = first term and d = common difference
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OpenStudy (cwrw238):
so plug in these values to get your answer
OpenStudy (acacia):
okay
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