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Which term of the AP a] 2, 5, 8, ….. is 68? b] -3, -5, -7, ….. is -101? c] 21, 42, 63, …..... is 420? d] 80, 76, 72, …... is 0?

Answer»


Answer :a] `rArr 3n = 69 rArr N = (69)/(3) = 23`.
b] `rArr - 2N = - 100 rArr n = (100)/(2) = 50`.
C] `rArr 21 n = 420 rArr n = (420)/( 21) = 20`.
d] `rArr 4n = 84 rArr n = (84)/(4) = 21.`


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