Number System Practice Test 2

Question : 29 of 40

Marks: +1, -0

1^3+2^3+3^3+...+50^3=1625625,

then find the value of

7 +56 +189+ ...... +875000

Solution:

1^3+2^3+3^3+...+50^3=1625625

7 +56 +189+ ...... +875000

=7(1+8+27+...+125000)

=7( 1^3+2^3+3^3+...+50^3 )

= 7 × 16,25,625

= 11,379,375

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