Math, asked by Tanveergupta7474, 11 months ago

How many terms of ap 24 21 18 must be taken so that their sum is 78

Answers

Answered by Anmol11374

7

an=a+(n-1)d

78=24+(n-1)-3

78=24-3n+3

78=27-3n

51=3n

n=17

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