**(102)**^{2} – (98)^{2} is equal to

^{2}– (98)

^{2}is equal to

(a) 200

(b) 400

(c) 600

(d) 800

**Answer : (d) 800**

**Hint:**

(102)^{2} – (98)^{2} = (102 + 98) (102 – 98) = 200 × 4 = 800

**96 × 104 is equal to**

(a) 9984

(b) 9974

(c) 9964

(d) None of these

**Answer : (a) 9984**

Hint:

96 × 104 = (100 – 4) (100 + 4) = 100^{2} – 4^{2} = 10000 – 16

= 9984

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