Mark against the correct answer 23-157-a 1121b -1121c 521d -521

#160;The #160;correct #160;option #160;is #160;(b).23 #8722;157=23 #160; #8722; #160;127L.C.M. #160;of #160;3 #160;and #160;7 #160; ...

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$\frac{2}{3} - 1 \frac{5}{7} = ?$

(a) $1 \frac{1}{21}$
(b) $- 1 \frac{1}{21}$
(c) $\frac{5}{21}$
(d) $\frac{- 5}{21}$

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