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UPSC CDS 2 2022 Math Paper
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© examsnet.com
Question : 36
Total: 100
If
M
is the mean of the first 100 even natural numbers, then what is the mean of the first 100 odd natural numbers ?
M
−
1
M
M
+
1
M
+
2
Validate
Solution:
👈: Video Solution
Mean of first n even numbers = (n + 1)
Mean of first n odd numbers = n
According to the question
Let the mean of the first 100 even numbers = M
⇒ (n + 1) = M -----(1)
Mean of first 100 odd numbers = n
⇒ (n + 1) = M
Fromequation (1)
⇒ n = (M − 1)
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