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Which rule represents the sequence (3,9,18,30,\ldots)?अनुक्रम (3,9,18,30,\ldots) को कौन-सा नियम दर्शाता है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (a_n=\frac{3n(n+1)}{2})(a_n=\frac{3n(n+1)}{2})
This is three times the triangular numbers, so (a_n=\frac{3n(n+1)}{2}). Recognize the pattern from additions (6,9,12).यह (3) गुना त्रिभुज संख्याओं का क्रम है इसलिए (a_n=\frac{3n(n+1)}{2})। लगातार जोड़ (6,9,12) से पैटर्न पहचानें।
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