Question

10. Nidhi forgot her friend's cell number and had to inform her about something urgent. She
remembered that only two digits were involved and were appearing alternatively but there
was no zero. Also, the cell number was divisible by 9. How many numbers should she try?
Write all the possible numbers. (Assuming, that cell number begins with 7, 8 or 9 only.)
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Answer 1

Answer:

answer will be 3 6 9 please make me brilliant