Let Sn = ∑k k∈[k=1,n] denote the sum of the first n positive int

1.	Let Sn = ∑k k∈[k=1,n] denote the sum of the first n positive integers. The numbers S1, S2, S3,…S99 are written on 99 cards. The probability of drawing a card with an even number written on it is – (A) 1/2 (B) 49/100 (C) 49/99 (D) 48/99
Answer» Correct :- (C) 49/99 Explanation :- 1,3,6,10,15,21,28,36,45, 55,66,78,91,105 till 98 terms 48 terms are even and 48 terms odd 99^th term = 99 x 100/2 =even Total even terms = 48 + 1 = 49 Probability =49/99

Let Sn = ∑k k∈[k=1,n] denote the sum of the first n positive integers. The numbers S1, S2, S3,…S99 are written on 99 cards. The probability of drawing a card with an even number written on it is – (A) 1/2 (B) 49/100 (C) 49/99 (D) 48/99

Answer»

Correct :- (C) 49/99

Explanation :-

1,3,6,10,15,21,28,36,45, 55,66,78,91,105 till 98 terms

48 terms are even and 48 terms odd

99^th term = 99 x 100/2 =even

Total even terms = 48 + 1 = 49

Probability =49/99

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Let Sn = ∑k k∈[k=1,n] denote the sum of the first n positive integers. The numbers S1, S2, S3,…S99 are written on 99 cards. The probability of drawing a card with an even number written on it is – (A) 1/2 (B) 49/100 (C) 49/99 (D) 48/99

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