RRB RPF RPSF SI and CONS Model Papers 3 with solutions

Question : 20 of 120

Marks: +1, -0

1 ^ { 3 } + 2 ^ { 3 } +.... + 9 ^ { 3 } = 2025,

then the approx. value of

( 0.11 ) ^ { 3 } + ( 0.22 ) ^ { 3 } + ... + ( 0.99 ) ^ { 3 }

Solution:

(c)

( 0.11 ) ^ { 3 } ( 1 ^ { 3 } + 2 ^ { 3 } + ... + 9 ^ { 3 } )

= 0.001331 ×2025

= { 13/31 } { 40000 } ≈ 2.695

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