numbers which are divisible by 7 but are not a multiple of 5
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AP = 7 ,14,21.....70
a=7
d=7
n=a+(n-1)d
n=7+7dn7
70=7n
n=10
n=10-2. because 35 ,70 divisible by 5
n=8
a=7
d=7
n=a+(n-1)d
n=7+7dn7
70=7n
n=10
n=10-2. because 35 ,70 divisible by 5
n=8
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