Substract the sum of the predecessor of the largest 4 digit number and the succeasor of the least 2 digit number from the sum of the predecessor of the largest 7 digit number and the sucessor of the least 3 digit number
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largest 4 digit no. is 9999
it predecessor is 9998
least 2 digit no is 10
its succesor is 11
their sum will be 10009...........(i)
largest 7 digit no is 999999999
its predecessor will be 9999998
least 3 digit no is 100
its sucessor is 101
their sum will be 10000099.........(ii)
subtracting (i) from (ii) we will get
10000099-10009
=9990090
hope it helps:-)
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