-1 OR 5*5=25 --

If we treat the expression as a pure boolean statement:

• 5*5 = 25 is true.
• -1 is typically considered true (nonzero).

Therefore True OR True = True.

Notes (language-specific caveats):

• In Python/JavaScript, using short-circuit OR (like -1 or True) can yield -1 as the result, not a boolean True.
• In C, -1 is nonzero (true) and the result of an integer OR would be 1 (true) as a boolean value.

If you’d like, tell me the exact language or exam context and I’ll tailor the evaluation.