Find the first term a and the common difference d for the following arithmetic progressions -
1, -2, -5, -8, ……
Comparing the given arithmetic progression with general form,
We get, a = 1
and common difference = difference of two consecutive term
i.e. (–2) – (1) = -3, (-5) – (-2) = -3.
Hence, First term a = 1 and common arithmetic difference = -3.
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