10,17,24,...
Let's find out if this arithmetic sequence can have two terms
that differ by 100.. The formula for the nth term of an
arithmetic sequence is
an = a1 + (n-1)d
The common difference d = 17-10 = 24-17 = 7 and the first term
a1 = 10. Substituting:
an = 10 + (n-1)(7)
an = 10 + 7(n-1)
an = 10 + 7n - 7
an = 3 + 7n
Let's find out whether the pth and qth terms
can differ by 100 for some p and q, where p > q and p and q
are positive integers.
ap = 3 + 7p
aq = 3 + 7q
Set their difference ≟ 100. (The question mark over the =
indicates that we are not sure that they can be equal.)
(3 + 7p) - (3 + 7q) ≟ 100
3 + 7p - 3 - 7q ≟ 100
7p - 7q ≟ 100
7(p - q) ≟ 100
p - q ≟
is not an integer. However p and q
are integers, and the difference of two integers
is always an integer. So p - q cannot equal
So the answer to the question asked is no.
Edwin