If a, b, c are in A. P. show that
a (b + c)/bc, b(c + a) /ca, c(a-b )/bc
are in A. P.
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2men and 7 boys can do a piece of working 4 days. it is done by 4 men and 4 boys in 3 days how long would it take for 1man or one boy to do it alone

Which expression is equivalent to 4 square root 6 divided by 3 root 2

Which graph represents an even function?