1.

(i) a3 = 15 तथा 5]0 न 125 दिया है। / और ८८ ज्ञात कीजिए।g -n e o "~

Answer»

a3 = 15 S10 = 125 a3 = a + 2d = 15 S10 = 10/2 (2a+9d) = 125 2a+9d = 25 2a+9d-2a-4d = 125-30 5d = 95 d = 19 a + 38 = 15 a = -23 a10 = a + 9d = -23 + 9(19) = -23+171 = 148



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