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in Number System by (41.5k points)
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Check your rule with the number 3192 which is a multiple of 7. 

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The given number is 3192 

⇒ a = 3, b = 1, c = 9, d = 2 

6a + 2b + 3c + d 

= 6 × 3 + 2 × 1 + 3 × 9 + 2.

= 18 + 2 + 27 + 2

= 49 → 49/7 (R = 0) 

∴ 3192 is divisible by 7’according to my law.

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