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Find the 21 St term of an AP 10, 8, 6 ............... |
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Answer» Explanation: given, FIRST term (a) =10 common difference (d) = 8-10 =-2 we know that, General term = a+(n-1)d. = 10+(21-1)(-2) given, (n=21) = 10+(20)-2 = 10-40 = -30 hence, 21 ST term is -30.
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