how many terms of the series 18+15+12+.... when added together will give 45?
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by sum of ap formulae n/2(2a-(n+1)d) can be used ...
I have added the negative sign because it is a decreasing ap...
I have added the negative sign because it is a decreasing ap...
rupam02:
sorry the n+1 should be n-1
can u resend i cannot see the whole steps you wrote
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