the value of the exprssion 1-2+3-4+5-6+__________+29-30 IS _____

Answer : 

Value of this expression  : $\frac{1 - 2 + 3 - 4 + 5 - 6}{29 - 30}$ 

We solve this as first solve numerator than denominator and at last we get our value from division  , 

= $\frac{9 - 12 }{29 - 30}$

= $\frac{- 3 }{29 - 30}$

= $\frac{- 3 }{- 1 }$

= 3                                                             ( As we know  $\frac{-}{-}$   = +  )                ( Ans )