If R = 4 in number 31R1 then by the rule of divisibility find that thi

1.	If R = 4 in number 31R1 then by the rule of divisibility find that this number is divisible by 11.
Answer» Given that R = 4 Therefore the number becomes to 3141 Divisibility by 11 1 x 1 + 4 x (- 1) + 1 x 1 + 3 x (- 1) = 1 – 4 + 1 – 3 = 2 – 7 = – 5 ∵ – 5 is not divisible by 11 So, 3141 or 31R1 is not divisible by 11.

If R = 4 in number 31R1 then by the rule of divisibility find that this number is divisible by 11.

Answer»

Given that R = 4

Therefore the number becomes to 3141

Divisibility by 11

1 x 1 + 4 x (- 1) + 1 x 1 + 3 x (- 1)

= 1 – 4 + 1 – 3

= 2 – 7

= – 5

∵ – 5 is not divisible by 11

So, 3141 or 31R1 is not divisible by 11.