write the expression an -ak for the AP a,a+d,a+2d hence find the common difference of the AP for which 11th term is 5 and 13th term is 79 a10-a5=200 20th term is 10 more than 18th term
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a=-370
a+d=-333
a+2d=-296
d=37
a+d=-333
a+2d=-296
d=37
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