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7th term -> 7(7) - 1 |. 5(7)+1
=48. |. =36
Sum of first 13 terms.
LHS ((6+90)/2)*13. RHS ((6+66)/2)*13
= 624. =468
Ratio of 7th terms
= 48:36
= 4:3
Ratio of sum of first 13 terms
= 624:468
=4:3(Though this result can be seen intuitively ..... yet)
=48. |. =36
Sum of first 13 terms.
LHS ((6+90)/2)*13. RHS ((6+66)/2)*13
= 624. =468
Ratio of 7th terms
= 48:36
= 4:3
Ratio of sum of first 13 terms
= 624:468
=4:3(Though this result can be seen intuitively ..... yet)
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