Question

A sequence consists of all 4 digits integers ending in 5 in increasing order

Answer 1

Digits if four integers.

Formula: 1005 + 10n, n could be 1 , 2, 3 , 4 , etc

S1 = 1005 + 10(1) = 1005 + 10 = 1015

S2 = 1005 + 10(2) = 1005 + 20 = 1025

S3 = 1005 + 10(3) = 1005+ 30 = 1035

S4 = 1005 + 10(4) = 1005 + 40 = 1045