Teaching UP TGT Mock Test Series 2025 Mathematics Sequences and Series

If (a + b), 2b, (b + c) are in HP, then which one of the following is correct?

1
a, b and c are in AP
2
a - b, b - c and c - a are in AP
3
a, b and c are in GP
4
a - b, b - c and c - a are in GP
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