Q. 11. (a) Look at the following matchstick pattern of squares (Fig 11.6). The squares are not separate. Two neighbouring squares have a common matchstick. Observe the patterns and find the rule that gives the number of matchsticks
in terms of the number of squares. (Hint: If you remove the vertical stick at the end, you will get a pattern of Cs.)
(a) 4 matchsticks
(b) 7 matchsticks
(c) 10 matchsticks
(d) 13 matchsticks
If we remove 1 matchstick from each then it forms a table of 3 i.e.,3,6,9,12,.....
So, required equation = 3x+1 , x= number of squares