how many numbers lie between 700 and 900 leaving a remainder 4 when divided by 9 ,15 and 18 .
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digit which are divided by 9 to give 4 as remainder are
706,715,724.........895
895=706+(n-1)9=>n=22
Similarly for 15
709,724,739....889
889=709+(n-1)15=>n=13
And for 18 all numbers are already included as in case of 9
Total are 13+22=45
But there may be common term which I give you as a task to do.you can also just write no and remove from total but there is mathematical way to do.
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