Others Maths Puzzle

some n consecutive numbers are written and unfortunately one number is erased and the remaining numbers average is 50and1/3 what is the number erased?

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Others Other Question

How many 4-dogits numbers are there whose decimal notation contains not more than two different disticnt dogits..?
option
a) 672
b) 576
c) 360
d) 448
find the four numbers which when multiply any three and adding with fourth would give the value 1869