NCERT Class XI Mathematics - Sequences and Series - Solutions
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Question : 72
Total: 106
Solution:
The given series can be written in the following way
5 2 + 6 2 + 7 2 20 2 ( 1 2 + 2 2 + 3 2 + . . . + 20 2 ) ( 1 2 + 2 2 + 3 2 + 4 2 )
=
k 2 −
k 2
=
−
=
=
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