Sequences and Series
Interactive practice questions
Consider the series $5+10+20$5+10+20 ...
Find the sum of the first $12$12 terms.
Easy
3min
Find the sum of the first $5$5 terms of the geometric sequence defined by $a=2.187$a=2.187 and $r=1.134$r=1.134.
Give your answer correct to two decimal places.
Easy
2min
Find the sum of the first $5$5 terms of the geometric sequence defined by $a=-4.186$a=−4.186 and $r=-2.848$r=−2.848.
Give your answer correct to two decimal places.
Easy
2min
Consider the geometric series $64+16+4$64+16+4$\ldots$…
Find the sum of the first $7$7 terms.
Easy
2min
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