The sum of n terms the series 1 + 1 + 1 + 1 + ..... is22²2³

As per the given series ,

1 +	1	+	1	+	1	+ ....... n to n terms is a Geometric series
	2		2²		2³

whose first term (a) is 1 and the commonratio (r) is
1 / 2 .
Using the given formula ,

S_n =	a(1 - rⁿ)
	1 - r

S_n = 2.		2ⁿ - 1		=	2ⁿ - 1
		2ⁿ			2^{n - 1}