Question

a) 1, 4, 5, 20
b) 30, 10, 9, 3
c) 2, 5, 6, 15
d) 3, 5, 9, 15

Answer 1

a) 1 , 4 , 5 , 20 , 21

×4 +1 ×4 +1

b) 30 , 10 , 9 , 3 , 2

÷3 -1 ÷3 -1

/ ×3 \/ ×3 \

c) 2 , 5 , 6 , 15 , 18 , 45

\ ×3 /\ ×3 /

d) 3 , 5 , 9 , 15 , 23

+2 +4 +6 +8