If \( \sum_{k=4}^{143} \frac{1}{\sqrt{k}+\sqrt{k+1}}=a-\sqrt{b} \), then \( a \) and \( b \) res...

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If \( \sum_{k=4}^{143} \frac{1}{\sqrt{k}+\sqrt{k+1}}=a-\sqrt{b} \), then \( a \) and \( b \) respec-
(W) tively are
(a) 10 and 0
(b) \( -10 \) and 4
(c) 10 and 4
(d) \( -10 \) and 0
(1)
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