The sum of a number and its inverse (or reciprocal) is equal to twice the number. What is the number?
ক. 1 or -1
খ. -2
গ. 1
ঘ. -1
উত্তর: 1 or -1
ব্যাখ্যা: Let the number be ' [গণিত] ' then its inverse (reciprocol) is [গণিত] . We are told that this equals twice the number i.e. [গণিত] So: [গণিত] subtract [গণিত] from both sides [গণিত] multiply both sides by [গণিত] squared [গণিত] take the square root [গণিত] OR [গণিত]
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