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Difference between sums of two series of n consecutive natural numbers is n2. Then which of the following is false?
  • a)
    Difference between the largest and the smallest number is 2n.
  • b)
    Among the largest terms of the two series, one is double of the other.
  • c)
    Difference between the averages of two series is n + 1.
  • d)
    All of these
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Difference between sums of two series of n consecutive natural numbers...
Let (p + 1), (p + 2),..., (p + n) and (g + 1), (g + 2), ...(q + n) are the two series.
(p + 1) + (P + 2) + ... + (p + n) = np + n(n -1 )/2
(q + 1) + (q + 2) + ... + (q + n) = nq +n (n -1 )/2
Without loss o f generality, let p > q
np + n(n —1)/2 - nq + n(n -1)/2 = n (p - q) = n2
(p - q) = n
1. The largest number = (p + n) and the smallest number is (q + 1). (p + n) - (q + 1) = (p - q) + (n - 1) =n  + (n - 1) = 2n - 1
2. (p + n) and (g + n) are the two largest terms of the two series. (p + n) - 2(q + n)
3. Average o f (p + 1), (p + 2)..... (p + n) = p + (n - 1 )/2
Average of (q + 1), (q + 2), ...(q + n) = q + (n -1 )/2
p + (n -1)/2 - q + (n -1)/2 = n
Thus, all the options are false.
Hence, option 4.
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Difference between sums of two series of n consecutive natural numbers is n2. Then which of the following is false?a)Difference between the largest and the smallest number is 2n.b)Among the largest terms of the two series, one is double of the other.c)Difference between the averages of two series is n + 1.d)All of theseCorrect answer is option 'D'. Can you explain this answer?
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