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Questions

1.3+2.4+3.5+4.6+................এর n -তম পদ পর্যন্ত যোগফল-
n (n+1) (2n-7)
1/6 (n-1)(2n+7)
1/6 n(n-1)
1/6 n(n+1)(2n+7)
ANS : 4
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