যদি 0.04×0.4×a=0.4×0.04×b হয়, তবে ab এর মান কত?

A 0.16
B 1.6
C 1.06
D 0.016

Correct Answer: 0.016

0.04×0.4×a = 0.4×0.04×b.'. 0.04×0.4×a = 0.4×0.4×0.04×0.04×b⇒ab = 0.4×0.04.'. ab = 0.016
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