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Questions

1.2+2.3+3.4+4.5+5.6+ ...... ...... ...... ধারাটির প্রথম n সংখ্যক পদের সমষ্টি কত?
12 n(n+1)(n+2)
13 n(n+1)(n+2)
14 n(n+1)(n+2)
15 n(n+1)(n+2)
ANS : 2
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