13 + 23 + 33 + ...................... + 603 = কত?
3348300
3348600
3348800
3348900
1, 2, 3, 4, ----------------- n পর্যন্ত স্বাভাবিক সংখ্যার যোগফল কত?
n2
n(n + 1)/2
n(2n + 1)/2
{n(n + 1)/2}2
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