Find r if coefficient of (2r+1) and (r+2)th term in expansion of (1+x) raised to power 43 are equal.

Find r if coefficient of (2r+1) and (r+2)th term in expansion of (1+x)

1.	Find r if coefficient of (2r+1) and (r+2)th term in expansion of (1+x) raised to power 43 are equal.
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