How many unordered pairs (d_1,d_2) are there such that d_1d_2=7875, d_1 1, d_2 1?

JEE Main Mathematics question

How many unordered pairs are there such that , , ?

Answer: 11

, so it has divisors. Excluding and itself (which would force the other factor to be ) leaves

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Question ID VK-020876