RRB Group D 2-Nov-2014 Shift 2 Solved Paper

Question : 50 of 100

Marks: +1, -0

106 × 106 + 94 × 94 = ?

Solution:

(106)^{2}+(94)^{2}=?

As we know

a^{2}+b^{2}=(a+b)^{2}-

2ab, therefore,

(106)^{2} ×(94)^{2}=

(100+6+100-6)^{2}-2(100+

(100-6)

=(200)^{2}-2[(100)^{2}-(6)^{2}]

=40,000-20,000+72=20072

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