If $\tan \,n\theta = \tan m\theta $, then the different values of $\theta $ will be in

  • A

    $A.P.$

  • B

    $G.P.$

  • C

    $H.P.$

  • D

    None of these

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If $\frac{1}{{b - c}},\;\frac{1}{{c - a}},\;\frac{1}{{a - b}}$ be consecutive terms of an $A.P.$, then ${(b - c)^2},\;{(c - a)^2},\;{(a - b)^2}$ will be in

Suppose the sum of the first $m$ terms of an arithmetic progression is $n$ and the sum of its first $n$ terms is $m$, where $m \neq n$. Then, the sum of the first $(m+n)$ terms of the arithmetic progression is

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The Fibonacci sequence is defined by

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