How many numbers between 1000 and 9999 are divisible by 7?
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1001, 1008, 1015,....... ,9996
a = 1001, d = 7 tn = 9996
tn = 1001 + (n - 1 )7
9996 = 994 + 7n
7n = 9002
n = 1286
a = 1001, d = 7 tn = 9996
tn = 1001 + (n - 1 )7
9996 = 994 + 7n
7n = 9002
n = 1286
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