plzz help me guys just for some days then i will leave....how many natural numbers are there between 100 and 1000, which have at least one of their digits as 5?
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Answer:
252
Step-by-step explanation:
the numbers are of the form : ★ # ©
★ may have 1 to 9 ; # may have 0 to 9 ; © may have 0 to 9
hence total numbers = 9 × 10 × 10 = 900
now....for the numbers not containg 5...
★ shd not have 5 ; # shd not have 5 ; © shd not have 5
means ....★ = 8 ; # = 9 ; © = 9
hence total numbers without 5 = 8 × 9 × 9 = 648
finally...the numbers with at least 5
= total numbers - numbers without 5
= 900 - 648
= 252
ayesha7351:
thanks sir
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