Length (8) strings (5) symbols से बनती हैं और हर symbol कम से कम एक बार आए। Count का inclusion-exclusion form कौन-सा है?
Length (8) strings are formed from (5) symbols and every symbol appears at least once. Which inclusion-exclusion form gives the count?
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A. (\sum_{i=0}^{5}(-1)^i{}^{5}C_i(5-i)8)
Simple Explanation
हर symbol का आना onto condition है और missing symbols हटते हैं। परीक्षा में at least once को inclusion-exclusion से करें। / Every symbol appearing is an onto condition and missing symbols are removed. In exams solve at least once by inclusion-exclusion.
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