Teaching NVS PGT 2024 Test Series Quantitative Aptitude Progression Arithmetic Progression

There are 'n' members in a family and if their ages are arranged in descending order 24, 21, 18 …. And so on. It forms an A.P. The sum of their ages is 78. Find the number of people in the family.

1
4
2
13
3
Both 4 and 13
4
None of these
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