If a^x = b and b^y = a , then find the value of xy .
ক) 1
খ) 0.
গ) a
ঘ) y
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ক) 139
খ) 140
গ) 141
ঘ) Cannot be determined
ক) Anwar Syed Haq
খ) Mokbula Manzoor
গ) Taherunnesa Abdullah
ঘ) Tahmina Anam
ক) July 2020-June 2028
খ) July 2020-June 2025
গ) July 2019-June 2026
ঘ) July 2021 June 2028
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