Others Maths Puzzle

Find the number of non-negative real roots of 2^y - 1 =y.
(1) 3
(2) 2
(3) 1
(4) 0
(5) 4

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Others Other Question

a, b, c, d are 4 different numbers and belongs to the set S = {-1, -2, -3, -4, -5}. What will be the largest possible value of a^b + c^d ??

a) 5/4
b) 7/8
c) 31/32
d) 10/9
e) 26/25 How many 5 digit numbers exist,divisible by, 3 which are in the form '1a2b6' where a,b are digits ?