Count n digit numbers divisible by given number | Returns count of n digit numbers divisible by ' number ' ; compute the first and last term ; count total number of which having n digit and divisible by number ; Driver code
< ? php function numberofterm ( $ n , $ number ) { $ firstnum = pow ( 10 , $ n - 1 ) ; $ lastnum = pow ( 10 , $ n ) ; $ count = 0 ; for ( $ i = $ firstnum ; $ i < $ lastnum ; $ i ++ ) if ( $ i % $ number == 0 ) $ count ++ ; return $ count ; } $ n = 3 ; $ num = 7 ; echo numberofterm ( $ n , $ num ) ; ? >