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456 X 456 – 302 X 302

(a) 128734
(b) 118564
(c) 116732
(d) 127856

Answer: (c) 116732

=456 X 456 – 302 X 302

=(456)2 – (302)2

=(456+302) – (456-302) Formula [a2 – b2=(a+b)(a-b)]

=758 X 154

=116732

The sum of three consecutive numbers is 93. The greatest among these three numbers is

(a) 27

(b) 28

(c) 30

(d) 32

Answer: (d) 32

Let the three numbers are x, x+1 and x+2

Then x+(x+1)+(x+2)=93

3x=90

x=30

Greater Number=(x+2)=32

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