Probability Part 3

Section: Mathematics

Question : 18 of 26

Marks: +1, -0

Three distinct numbers are selected randomly from the set {1,2,3,...,40}. If the probability, that the selected members are in an increasing G.P., is ‌

,gcd(m,n)=1, then m+n is equal to ‌‌‌‌ .

[2 Apr 2025 Shift 1]

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Common ratio	Last triplet	Total
r=2	10,20,40	10
r=3	4, 12, 36	4
r=4	2, 8, 32	2
r=5	1, 5, 25	1
r=6	1, 6, 36	1
	Total = 18