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The fifth term of a p …

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The fifth term of a p is 26 and its 10th term is 51 find a p

Posted by Prarthana R 5 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

??Geetha Sree ?? 5 years, 10 months ago

U can't get the whole A.P until n is mentioned. I don't understand why people answer for 15th term of the A.P.

0Thank You

Yogita Ingle 5 years, 10 months ago

A₅ = 26
a + 4d = 260........... (1)
a₁₀ = 51
a + 9d = 51...............(2)

Subtracting eq.(i) from eq.(ii) we get
d = 5
putting d = 5 in eq.(i) we get
a + 4(5) = 26
a + 20 = 26
a = 6
a₁₅ = a + 14d
a₁₅ = 6 + 14(5)
a₁₅= 6 + 70
a₁₅ = 76
Hence the 15^th term of the AP is 76.

1Thank You

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