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AP EAMCET · Maths · Definite Integration

If a and b are positive integers such that b>a, then limn1na+1na+1+1na+2++1nb=

  1. A
    logba
  2. B
    logab
  3. C
    log(ab)
  4. D log(a+b)
Verified Solution

Answer & Solution

Correct Answer

(A)

logba

Step-by-step Solution

Detailed explanation

We have, limn→∞1na+1na+1+1na+2+…+1nb =limn→∞1na+1na+1+1na+2+…+1na+nb-a =limn→∞1na+1na+1+1na+2+…+1na+nb-a =limn→∞1n1a+1a+1n+1a+2n+…+1a+nb-an =limn→∞∑r=0nb-a1n1a+rn Now, replacing…