how many numbers are there between 1 and 1000 which when divide by 7 leave a remainder 4

Ans is 142
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142
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First term=11 Common difference=7 Nth term=998 Nth term=First term+(N-1)Common Difference =》 998=11 (N-1)7 =》 998-11=7N-7 =》 987+7=7N =》 N=994/7 . ° . N=142
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