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Nth Term of a GP

if th sum of ...

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if th sum of n terms of a progression be a quadratic expression in n .Show that it is an arithemetic progression

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Q. The sum of first

^{'} n^{'}

terms of an Arithmetic Progression is

" 5 n^{2} - 2 n "

20^{t h}

The sums of ' $n$ ' terms of two arithmetic progression are in the ration $5 n + 4 : 9 n + 6$ , find the ration of their $18^{t h}$ terms.

Q. The average of 5th and 6th term of an arithmetic progression whose sum is

5 n^{2} - 6 n

Q. The sums of n terms of two arithmetic progressions are in the ratio

5 n + 4 : 9 n + 6

. Find the ratio of their

18^{t h}

n

terms of two arithmetic progress are in the ratio

5 n + 4 : 9 n + 6

. Find the ratio of their

18^{t h}

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