some birds settled on the branches of a tree.first,they sat one to a branch and there was one bird too many.Next they sat two to a branch
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Take n.o of birds is X
X+1=y
y+1=x/2
x/1=a
So
2a+2=2y
‐2a+1=‐y
=3=y
So,n.o of branchesis3
There was 1 bird which does not had place to sit . So they sat 2to 1branch .So there are 3 branches
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