When the number is in the form 7N + 1 ,
which can also be written as ,
7×N + 1
⇒ (multiple of 7) + 1
Therefore , when we divide 7N + 1 by 7,then we will get a remainder 1.
For example:22, 29
22 can be written as,
7×3 + 1
29 can be written as ,
7×4 + 1
Thus,22 and 29 will leave the remainder 1 when divided by 7.
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