7, 13, 19, ... , 205यहाँ, a = 7d = 13 - 7 = 6an = 205माना पदों की संख्या = nतब, an = 205 a + ( n - 1) d = 205 7 + ( n - 1)6 = 205 6(n - 1) = 205 - 7 6(n - 1) = 198 n - 1 = 33 n = 33 + 1 n = 34अत: दी हुई A.P. में 34 पद हैं।
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