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OpenStudy (anonymous):
solve with formulas of sequence & series; Find the sum of of all no. between 200 and 400 which are divisible by 7.
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OpenStudy (anonymous):
hmmm, what is the first number in this sequence divisible by 7?
OpenStudy (anonymous):
203
OpenStudy (anonymous):
Formula?? y = 7x + 203
OpenStudy (anonymous):
203
OpenStudy (anonymous):
the series is 203+210+...+392+399
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OpenStudy (anonymous):
29 terms are there just use the formula n/2(2a+(n-1)d) where n is 29, d is 7 and a is 203
OpenStudy (anonymous):
Answer is 8729
OpenStudy (anonymous):
Are u fine with it??? Need some more explanation????
OpenStudy (anonymous):
no. thank u.
OpenStudy (anonymous):
fine
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