observe the pattern in the following figure and write an expression for the n th case.
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a) No. of squares in 1 fig. is 5 and each successive fig. has 3 more squares
No. of squares in nth case is = 5 +3(n-1)
b) No. of square in 1 fig. is 2 and each successive fig, has 2 more squares
No. of squares in nth case is = 2 +2(n-1)
where n is the total no. of cases
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