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limn1n+1+1n+2++16n is equal to

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a
log⁡2
b
log⁡3
c
log⁡5
d
log⁡6

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detailed solution

Correct option is D

limn→∞ 1n+1+1n+2+…+16n=limn→∞ 1n+1+1n+2+…+1n+5n=limn→∞ ∑r=15n 1n+r=limn→∞ 1n∑r=15n 11+rn∵  Lower limit of r=1∴ Lower limit of integration =limn→∞ 1n=0 ∵ Upper limit of r=5n ∴ Upper limit of integration =limn→∞ 5nn=5 from eq(i) ∫05 11+xdx=[log⁡(1+x)]05=log⁡6−log⁡1=log⁡6


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