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put bar upon two digits from left uget bar on 79 and 2 is left out
now carry the process by using 1 square
u get reminder as 1
later add 1+1=2
now multiply a number 21*1
                                     22*2.....27*7 we get ans
as 179
put that value..u get 17 as answer u can refer to the foloowing pic if required

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