The sum of the first 20 terms common between the series 3+7+11+15+ | Filo
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Class 11

Math

Algebra

Sequences and Series

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The sum of the first terms common between the series and  is 

Correct Answer: Option(a)
Solution: 3, 7, 11, 15, 19, 23, 27, 31...........   difference 4
1, 6, 11, 16, 21, 26, 31........  difference 5

common terms are 11,31....
common term, a 11
Common difference, d=20


so for sum of first 20 terms
 



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