Please explain the 14th question
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apply the formula: Sn=n/2+(2a+(n-1)d)
where 'Sn' =-55, ' a ' is -15 and ' d ' is +2
hope it helps
please mark it as brainliest
where 'Sn' =-55, ' a ' is -15 and ' d ' is +2
hope it helps
please mark it as brainliest
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