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algol [13]
3 years ago
6

Let a, n, b, r, and k be integers. If a = nb+r and k|a and k|b, then k|r

Mathematics
1 answer:
Kryger [21]3 years ago
5 0

Answer:

Proof for k|r

Step-by-step explanation:

We are given that a, n, b, r and k are integers.

Also,

a = nb + r

Since k divides a and b, we can write,

a = rk and b = sk, where r and s are integers.

Now, we have to prove that k divides r as well that is k|r

Putting value of a and b in the equation, we get:

rk = n(sk) + r\\r = rk - nsk\\r = (r-sn)k

Since, (r-sn) is an integer, k divides r.

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