13 + 20 + 27 + 34 + ……………… + 111 ধারাটির পদ সংখ্যা কত?

A 10

B 13

C 15

D 20

Solution

Correct Answer: Option C

এখানে a = 13, d = 20 - 13 = 7
আমরা জানি, শেষ পদ = a + (n - 1)d
বা, 111 = 13 + (n - 1)×7
∴ n = 15

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