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ID#6583 HSC Higher Math 2nd MCQ (Dhaka 2025)

$i^{16n + 15}$ এর মান কত?
ক) $-1$
খ) $1$
গ) $-i$
ঘ) $i$

ব্যাখ্যা

আমরা জানি, $i^4 = 1$। সুতরাং, $i^{16n + 15}$ কে লেখা যায় $i^{16n} \cdot i^{15}$। $i^{16n} = (i^4)^{4n} = (1)^{4n} = 1$। এবং $i^{15} = i^{4 \cdot 3 + 3} = (i^4)^3 \cdot i^3 = (1)^3 \cdot i^3 = i^3 = -i$। অতএব, $i^{16n + 15} = 1 \cdot (-i) = -i$।
Resource Details
Exam HSC
Subject Higher Math 2nd paper
Chapter 3
Board Dhaka
Year 2025

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