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in his question, \$means power operator 21 power 2 = 441 in GATE they will clearly specify what is the$ represent
There are 7 operands and 5 binary operators.. :/

There has to be 6 binary operators :|
\$is a binary operator only... Though it is not a standard question, discussion on \$ is unnecessary
Okay..i thought \$ marks the end of a string.. as per the convention