how many number lies between 600 and 1000 divisible by both 7 and 9
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7 x 9 = 63 (d)
so divide 600 by 63 the quotient 9
so 63x 10 = 630 the first number(a)
1000 ÷ 63 = 15 quotient
63 x 15 = 945 is last number (l)
the number (n) = ](945 - 630)/63] + 1
= 315/63 +1
= 5 + 1
= 6
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