किती विद्यार्थ्यांना स्पायडरमॅन किंवा बॅटमॅन आवडतात?

26 students like at least one character and 8 like both. Students who like only one of them (either Spiderman or Batman, but not both) = 26 − 8 = 18 (12 only Spiderman + 6 only Batman).