I need help on these both (it's 12 year old math)
2 answers:
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Good evening ,
Answer:
<h2>153 dimes.</h2>Step-by-step explanation:
1+2+3+...+17 = (17×18)/2 = (17×18)÷2 = 153 dimes.
it’s the sum of 17 terms of a geometric series.
:)
