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How many terms of the AP : 24, 21,18,......

How many terms of the AP : 24, 21,18,... must be taken so that their sum is 78?

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OSWAL PUBLICATION-C.B.S.E 2020 CLASS -X (DELHI)-DELHI SET -I ( SECTION-C )
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  13. If 4 times the 4^(th) term of an A.P. is equal to 18^(th) times the 1...

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  14. How many terms of the AP : 24, 21,18,... must be taken so that their s...

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