the average of 4numbers is 7. if the sum of first 3number is 20,find the fourth number
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Step-by-step explanation:
s3=3/2(2a+(3-1)d)
20=3/2(2a+2d)
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Answered by
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Answer:
47__75(#-₹7)&8*6-&_&(&&+*8&_5_"(6₹6₹&6__8&__₹4_6'(;₹!0
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