Find ' \( a \) ' if the \( 17^{\text {th }} \) and \( 18^{\text {th }} \) terms of the expansion....

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Find ' \( a \) ' if the \( 17^{\text {th }} \) and \( 18^{\text {th }} \) terms of the expansion
\( \mathrm{P} \)
\( (2+a)^{50} \) are equal : -
W
(1) 0
(2) -1
(3) 1
(4) None of these


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