Question

Which of the following rational no. has terminating decimal expansion

(a) 13
by 3125

b) 29
by 343

c) 77
by 210

d)1
by 7​

Answer 1

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THERE IS A TRICK TO SOLVE SUCH QUESTION WHICH IS THE DENOMINATOR SHOULD BE A FACTOR OF 2 TO THE POWER N OR 5 TO THE POWER N OR BOTH( means 2^N*5^N)

FIND THE FACTORS OF DENOMINATOR AND YOU WILL KNOW