1.

Which of the following is equal to 1?(a) 20 + 30 + 40 (b) 20 × 30 × 40(c) (30 – 20) × 40 (d) (30 – 20) × (30 +20)

Answer»

(b) 20 × 30 × 40

For any non-zero integers ‘a’ and ‘b’ and whole numbers m and n,

a0 = 1

So, 20 = 1, 30 = 1, 4o = 1

Then, (1 × 1 × 1)

= 1


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