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31. let the numbers are x, x+1,x+2, x+3 , x+4

given sum =370

hence x +( x+1) + (x+2) +( x+3) + ( x+4) = 370

or 5x+10 = 370

or, 5x = 370-10 = 360 ; x = 360/5 = 72

hence the series is 72,73,74,75,76

and Fourth digit : 75 (answer)

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