-1 OR 5*5=26 --

Interpret as a boolean expression: -1 OR (5*5 = 26)

• 5*5 = 26 is false (25 ≠ 26).
• -1 is non-zero, so true in boolean logic.

Thus, true OR false = true.

If your language uses:

• Logical OR (||): result is true (often represented as 1).
• Bitwise OR (|) with integers: -1 | 0 = -1 (which is nonzero, i.e., truthy in boolean context).

If you tell me the exact language and whether you meant logical or bitwise OR, I’ll tailor the answer.