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The 10th and 18th term of …

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The 10th and 18th term of AP are 41&73 respiculty find 26th term

Posted by Samarthsunil3 Samarthsunil3 7 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Swati Khatri 7 years, 3 months ago

a10 = 41, a18 =73 and a26 =? a10= a + 9d = 41-------(1) a18= a + 17d=73-------(2) (-). (+). (-) ----------------------- -8d = -32 d=4 Put d=4 in eqn.(1) a+9d=41 a+9(4)=41 a+36=41 a=5 Therefore, a26= a+25d = 5+25(4) = 5+100 a26= 105

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Niyati Gupta 7 years, 3 months ago

a26=105

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Latha Latha 7 years, 3 months ago

10th term of AP is 41 = a+9d=41---(1) 18th term of AP is 73 =a+17d=73----(2) Solve (1)&(2);a+9d=41 a+17d=73 ------------------ -8d=-32 d=4,substitute d= 4in (1) a+9(4)=41 a=5 So a26=a+25d =5+100=105

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