Question

Find the sum of all factor which ends with zero of 23 × 54 × 72?

A 322400 Correct Answer Incorrect Answer
B 622440 Correct Answer Incorrect Answer
C 522580 Correct Answer Incorrect Answer
D 345260 Correct Answer Incorrect Answer

Solution

23 × 54 × 72 = 2×5(22 × 53 × 72) 10(1+2+4) (1+5+25+125) (1+7+49) 10×7×156×57=622440 option B is right.

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