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The number of zeros at the end of the product of all prime numbers between 1 and 1111 is?
Read Solution (Total 2)
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- prime no.s betn 1 & 1111 are 2,3,5,7,11,...
there is no other prime no. ending with 5 as unit digit, except one '5'
2*5= 10 gives only one zero in the product of all prime no.s
so,number of zeros at the end of the product = 1 - 10 years agoHelpfull: Yes(163) No(2)
- only one zero because 0 occur when 2 and 5 are present
- 10 years agoHelpfull: Yes(8) No(3)
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A train goes from stations A to B. One day there is a technical problem at the very beginning of the journey & hence the train travels at 3/5 of it's original speed and so it arrives 2 hours late. Had the problem occured after 50 miles had been covered, the train would have arrived 40 min earlier(i.e., only 120-40 = 80 min late). What is the distance between the 2 stations?
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