A two digit no. is obtained by either multiplying the sum of the digits by 8 and adding 1; or by multiplying the difference of the digits by 13 and adding 2. Find the no. How many such nos. are there.
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x+y=8+1 then x+y=9 x_y=13+2then x-y=15 then 2x=24 x=24/2 then x=12
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