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How many 3 digit numbers are …

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How many 3 digit numbers are divisible by 7.. question from chapter 5 arithmetic progression

    • Posted by Om Jagtap 5 years, 7 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Akhil? . 5 years, 7 months ago

    The Ap's formed are - 105 , 112 , .....994 .
    An = a + (n-1) d
    => 994 = 105 + (n-1) 7
    => 889 = 7n - 7
    => 896 /7 = n
    => n = 128
    So, 128 three digits number are divisible by 7..

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