HCL Company Numerical Ability Age Problem

In a village there are 150 men and 90 women in present time.
if in next year population will be P=(a^2 +b^2)^1/2 , and in every year men are reduces 10%.
a. what is population of after 2 year.
b. after how many years women become more than men.

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HCL Other Question

4,64,256,1024,...? .. What does the hexanumber E78 in radix 7.
(a) 12455
(b) 14153
(c) 14256
(d) 13541
(e) 131112