the first term of an arithmetic sequence is 8, the last term is 56 and the sum is 416. find the number of terms.
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the first term of an arithmetic sequence is 8, the last term is 56 and the sum is 416. find the number of terms.
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Step-by-step explanation:
Formula :Sn=n/2(2a1)+(n-1)d)
Formula for getting the d: an=a1+(n-1)d
and then substitute mo lng