1. If 8, a, B, C, 26 are known to form an arithmetic sequence, find the average and sum of these five numbers, 1. It is known that 8, a, B, C and 26 constitute the arithmetic sequence, and the average and sum of these five numbers are obtained 2. It is known that 8, a, B, C, D and 26 constitute the arithmetic sequence, and the average and sum of these six numbers are obtained

1. If 8, a, B, C, 26 are known to form an arithmetic sequence, find the average and sum of these five numbers, 1. It is known that 8, a, B, C and 26 constitute the arithmetic sequence, and the average and sum of these five numbers are obtained 2. It is known that 8, a, B, C, D and 26 constitute the arithmetic sequence, and the average and sum of these six numbers are obtained

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