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Question
১ + ৫ + ৯+ ------------+৮১=?
৯৬১
৮৬১
৭৬১
৬৬১
ANSWER : 2
Descrption
n তম পদ = a + (n - 1)d অর্থাৎ 81 = 1 + 4n - 4 বা, 4n - 3 = 81 বা,n = 21 সমষ্টি = (শেষপদ + প্রথমপদ)/২ * পদসংখ্যা = (81 + 1)/2 * 21 = 861
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