Answer :

Final answer:

The product of all the numbers on the dial of a standard telephone (1-9 and 0) is zero, because any number multiplied by zero is zero. Therefore, the correct answer is D 'None of these'.

Explanation:

The question asks for the product of all the numbers on the dial of a telephone. The numbers on a standard telephone dial are 1 through 9 and 0. Multiplying these numbers together, you get:

1 × 2 × 3 × 4 × 5 × 6 × 7 × 8 × 9 × 0 = 0

Since any number multiplied by zero is zero, the product is 0. Thus, the correct answer is D. None of these.

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