1. 

Evaluate : (2.39)2 - (1.61)2
2.39 - 1.61

A. 2
B. 6
C. 4
D. 8

Answer: Option C

Explanation:

Given Expression = a2 - b2 = (a + b)(a - b)
a - b (a - b)
= (a + b) = (2.39 + 1.61) = 4.