if a1, a2, a3 … upto a21 are in A. P with common difference d, then a1, a5 , a9, a13 ​

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if a1, a2, a3 … upto a21 are in A. P with common difference d, then a1, a5 , a9, a13 ​

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Vivian 2 weeks 2021-09-10T01:03:38+00:00 1 Answer 0 views 0

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    2021-09-10T01:05:05+00:00

    Answer:

    are also in AP. with difference 4d

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18:9+8+9*3-7:3-1*13 = ? ( )