Mathematics for IGCSE & O level - Sequences (Section 4 - No. 23)
Which rule describes the following sequence, where the nth term is denoted by Tn: 7, 12, 17, 22,...?
Tn = 5n + 2
Tn = 5n + 7
Tn = 2n + 5
Tn = 7n + 5
Giải thích
T_n increases by 5. When n = 1 the value should be 7; substitute n=1 into 5n+2.